Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bf6c632d15c181…

MALICIOUS

PDF

76.3 KB Created: 2021-03-06 12:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a7c7268c52d0cf7f480d03c0046bc0f7 SHA-1: 7f0e0658f487c955d4dabceb9f316d935fa07878 SHA-256: 88bf6c632d15c1813c5ed0036022ae9f3498a7b699831ef5403ebe364d247e8c
186 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 external links, many pointing to disposable hosting, suggesting it's part of an SEO spam or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to educational materials, specifically 'Ideal gas law worksheet answers'. No scripts were extracted from this sample, but the presence of numerous external links and the overall structure strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://golowaki.ru/award?keyword=ideal+gas+law+worksheet+answers+chemistry+if8766 PDF link annotation
    • https://nimamadud.weebly.com/uploads/1/3/1/8/131856523/sogopotazuzej.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/b951f88e33.pdfIn PDF document text
    • https://boforotove.weebly.com/uploads/1/3/5/3/135393238/dutanavur_gaxupanefin.pdfIn PDF document text
    • https://nurobajaxi.weebly.com/uploads/1/3/4/5/134507542/6ed13a8a77.pdfIn PDF document text
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/pimalamejelele.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/mifadidimat_xojakilalevub_lobodora_sazobik.pdfIn PDF document text
    • https://tonofoku.weebly.com/uploads/1/3/4/0/134096462/5999754.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://uploads.strikinglycdn.com/files/27a8a17b-e9d1-4e25-95c7-3bff94682776/how_many_red_letter_verses_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86712e0-dcc5-4552-88ec-e8ae02feef73/vivuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda582a8-c6d4-486d-b36b-3c7e4f0ce4b5/carson_dellosa_education_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225ee520-4596-4866-829a-cfb6c1583dc4/bifikozoxapesuvufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3f3f60-122d-48e0-b7f0-60370612e357/sezuzetibumovaliled.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/lightroom_mobile_presets_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/47737454858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4852e2-16e1-4e70-851c-070b91789797/29728567126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3215a63d-57f6-4a29-8958-8666f61138af/viwiwametasunovadu.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/lawesuwukikabipoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee50b9f4-191b-4756-a9b2-535f1f262a06/singer_simple_sewing_machine_3223_review.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_1559894ff20d46b492a5e53e0979760b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68aac61b-cf59-46c4-b50f-100511acce4c/joxesilima.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/33916427725.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_1203b4304d2d4a61b4269a74b9edddd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/call_forwarding_android_8._0.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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 5848 bytes
SHA-256: a760fda2844c40d7fd1d86baff4d1cc830fc07f2d3d14251abe45601f29e8507
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10220 bytes
SHA-256: 3b59ed28872c18dbd7a42ecd2c660e83d6b2f48d3ad1ccd3aae45061c9353f45
font_02_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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