Malicious PDF — malware analysis report

Static analysis result for SHA-256 616c3ed44f62a2b0…

MALICIOUS

PDF

81.0 KB Created: 2021-03-13 18:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53b3529e70a83524848ebe4090d5e923 SHA-1: 52c552927e27acf4ace5f1703f8b5a6f07d8d116 SHA-256: 616c3ed44f62a2b0e8ff815e4848ab6fb93242786753ed5921b7c649d4d2c367
196 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, exhibiting characteristics of a phishing lure and a link farm. It contains numerous external links, many pointing to PDF files hosted on various domains, suggesting an attempt to distribute content or redirect users to malicious sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic to bypass gateway scanning by instructing the user to open a password-protected archive, implying the PDF itself is a delivery mechanism for a more dangerous payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/123?utm_term=transformando+agua+em+vinho+infantil
    • http://mizigigutafax.iblogger.org/tutorial_guide_to_autocad_2020.pdf
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/2d0af0e304f22.pdf
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/faxepekakijuma-sowutuviwitedu.pdf
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/fijezonotox-ronenulu-nejizemijupe-dobowotevuro.pdf
    • https://libubosimidod.weebly.com/uploads/1/3/5/3/135333631/jowuv.pdf
    • http://bumisojef.iblogger.org/what_causes_caliper_piston_not_to_retract.pdf
    • https://figalinob.weebly.com/uploads/1/3/1/8/131871825/julamemejujuvunof.pdf
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/jajepudoxuxizif-gonisafurixasid-jafevagaja-xenupel.pdf
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/zexadedo-wezajebabogowol-xugofeba-jetibozire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/besafefaf/zidal.pdf
    • https://s3.amazonaws.com/xeruxaxer/60909158294.pdf
    • http://kugilib.rf.gd/76321653142.pdf
    • http://fegubitexore.rf.gd/56454362906.pdf
    • http://zagufuv.epizy.com/giwipekowosonawoviv.pdf
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_7d7fb9e6f516452ebb05e7dda8ec0a24.pdf?index=true
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_9ae3e901b7e14cf2998ee52c84b6d44d.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_e89bbdb0ec554414b250a867b6cd4682.pdf?index=true
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_31572e7c8c0d4a28bfe9951e7b62e079.pdf?index=true
    • https://s3.amazonaws.com/woxewiwupir/hormone_replacement_therapy_nz_guidelines.pdf
    • https://s3.amazonaws.com/pegebunov/label_animal_cell_answers.pdf
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_4a74f0c14df247dea8aa35560ebd5c8d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2c.bin
13ad1abf5a8d0e207eec9f61f026c82763d62071e70a07e333a46e1fcf427fb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 5332 bytes
font_01_sfnt_off00010d29.bin
b47a612c616949e9a2b9704685939743f1602021c4f67eb1f6d3fd2875c2a45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 13196 bytes

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