Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01ee708eb01682f…

MALICIOUS

PDF

80.9 KB Created: 2021-03-18 23:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 734de9c8a5b5cd180ca74c9ebdf464ce SHA-1: c8ebecc9cdf83807e4c8614ffb3674f5470b3a88 SHA-256: c01ee708eb01682faeaef7dfe41fb4c0b63698935a712ce177815adf1970017e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/wix?keyword=english+fundamentals+16th+edition+pdf+free In PDF document text
    • http://dilofab.22web.org/4135562797.pdfIn PDF document text
    • http://sevelorovuwo.66ghz.com/vespa_lx_50_manual.pdfIn PDF document text
    • http://fusavexupisedi.iblogger.org/how_do_you_reset_an_omron_blood_pressure_monitor.pdfIn PDF document text
    • https://fabopabe.weebly.com/uploads/1/3/4/7/134704260/2411636.pdfIn PDF document text
    • https://cdn.sqhk.co/vibejimipu/hhfGgdL/jexusokukagovapiwebaxagud.pdfIn PDF document text
    • https://natuxebifenukud.weebly.com/uploads/1/3/1/3/131378868/venimipab.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/yieygf6/kiwuxivewagusexu.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/hihifhc/36453271526.pdfIn PDF document text
    • https://zerivomixiloz.weebly.com/uploads/1/3/4/6/134664353/e3982.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/4498397.pdfIn PDF document text
    • https://naxetiluwe.weebly.com/uploads/1/3/1/4/131483002/9389548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_68fde3f796444dd1a913889ea3013797.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_b017003f7d6349749ca9966c86eb6220.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_1f07ff1a096d4aa4a13684d3eb00a2a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b528fe6b-42c8-4890-91b7-a8243395fe44/bmw_navigator_vi_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31cb62a9-767b-47ce-b144-67575946c7ff/kenmore_elite_washer_troubleshooting_water_leak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f62f26-bce2-4dfb-9fc1-862d71af9254/36086503251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6342ef8-568d-440c-a57e-1f8d6c2f7546/34986772616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0971b2-db0c-412e-a6f7-6f383773733f/cost_to_rebuild_powerglide_transmission.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_5e3bc2f7c25f44d1b1093eb273667df5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4a5803-87b2-46bf-b854-600969486f51/29884048274.pdfIn PDF document text
    • http://vulebirawesajo.rf.gd/good_english_grammar_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730a6132-0a78-4490-851d-28854158edfa/lematan.pdfIn PDF document text
    • http://mizixizomafupez.epizy.com/chrome_link_offline.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_2d0ab066ec214bfeabedfdcaf91cb9e3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 5500 bytes
SHA-256: a727543bcf7c85daec7d3f01a2dd7aeab9dda94c8f33fca320dc836145a367c7
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 11284 bytes
SHA-256: aacb797dfdbde61a73615d9cade61bd6890ae79c7e52bed95003095580bd8bdd
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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