Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79287b5d3e43369…

MALICIOUS

PDF

77.8 KB Created: 2021-05-05 20:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 965ee0d3d8c413e81ceecc797d6756dd SHA-1: 761dd2ca220784460533d89044701359a39c4498 SHA-256: b79287b5d3e43369567aaa0a7b1229ff20f2091d996387009005043d70c34d1b
206 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by its structure as a link farm hosted on disposable domains. The presence of numerous external links, many pointing to Weebly and other disposable hosting services, suggests an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF's malformed stream and ML classifier output strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://gimoguvi.ru/strik?utm_term=jvc+everio+camcorder+reset PDF link annotation
    • https://cdn.sqhk.co/surodamiz/j2PBcgg/suxeduxanugogawurapego.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/96e77bd73a822ac.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/nalunofugikufada.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/ronirifu.pdfIn PDF document text
    • https://noribazab.weebly.com/uploads/1/3/1/8/131871745/vodid-radudegerukofi-zewomul.pdfIn PDF document text
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/6121819.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/tH0QjiJ/88896185041.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/zinas_gadogugupene_jareke.pdfIn PDF document text
    • http://difuraw.22web.org/gogikukalirorunijodosomo.pdfIn PDF document text
    • http://faketikus.22web.org/14724270923.pdfIn PDF document text
    • https://cdn.sqhk.co/kazaluxi/jelohdT/computer_launcher_apk_download_uptodown.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/07bf7c6a1f129c.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/hgdhii3/haircuts_near_me_open_now.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
    • http://xobekorafoza.epizy.com/vubele.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_2c850d378af54389a2597f163457ec00.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_81bd6d17c2c8478c85ed399472610bfe.pdf?index=trueIn PDF document text
    • http://nonozud.rf.gd/acer_iconia_a700_stock_rom.pdfIn PDF document text
    • http://gakuzefesax.rf.gd/the_gerstein_report_movie.pdfIn PDF document text
    • http://kerimanerebi.epizy.com/64182904858.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_bbe93cefd89043a0b7b00efb227defd7.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_5231f7ada8be44c781afb57c5d09e377.pdf?index=trueIn PDF document text
    • http://nuxibuzejapise.epizy.com/mastering_bitcoin_download.pdfIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_2e69daf6ea184f658d849d2628743445.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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 4784 bytes
SHA-256: c566d3121e832fd8c9d9a7002b8c90bd94f719474cfffbb92d1ffc79775ec4a3
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 11640 bytes
SHA-256: f532921756979fcbc5bb8f47d88fe265f6e75f606e78508d52d9c8dd6e94b72d
font_02_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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