Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94e8cd1e96919c8…

MALICIOUS

PDF

85.7 KB Created: 2021-03-19 10:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e1fcfca7d2f9802cf56e444968ef8651 SHA-1: 364d76fe119f0c4eb50e000599512b482315ac41 SHA-256: a94e8cd1e96919c89bb3040a062a3810b9597b2fd097b7f73954c57751abc925
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one identified as a malicious redirector. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=run+n+gun+i+love+cats+song In PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/9506398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_604a9ebce1328.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/rowugadewel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403561/normal_5ffa6950c7fbc.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/4d6851339d664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_600aa3bf348e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_600ae81e993c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5fe43442cad74.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/476081.pdfIn PDF document text
    • https://duraxotiparukog.weebly.com/uploads/1/3/0/7/130776433/af97ecca56a42df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_600c40d73c862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5fe80580481fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5fffbc2b74335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_602b0a8a41858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_3c83996a69c5480cabd9b2db34cd4374.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_e8018c8402364515850ee3441b198814.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/juxikorakigowil.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_ab63a89594ec40e4b25b9ac6a3870ea4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/loxilofididosoxaxanuselav.pdfIn PDF document text
    • http://setowibuvi.epizy.com/2002_mercury_150_xr6_reviews.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_d3b79907235d487ab01754b4b319c194.pdf?index=trueIn PDF document text
    • http://boxifiret.rf.gd/ibm_cognos_report_studio_if_then_else.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/lizanej.pdfIn PDF document text
    • http://jududupozibuj.rf.gd/suzawitevolimewekaf.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/govufumodomimemopiw.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/boatswain_mate_2nd_class.pdfIn 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_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 4584 bytes
SHA-256: 697720155ba64e850d1a3bb51843c3454dc1b3f649947ec6c823173d588396a2
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 4940 bytes
SHA-256: 2dbf1769fe41dbe7a88daba55f45e39091eca50e20fc63da81c51e5e6e99016e
font_02_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 11088 bytes
SHA-256: d8950a95f8375062ff6d9484eacca653d06f773224dad4a2650ab1214aa7b707