Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b864baead34b90…

MALICIOUS

PDF

74.3 KB Created: 2021-03-25 00:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6ddc9c7d43ea94c6d914d3d8ed2310f9 SHA-1: 6c4f40744833c84e757e5b03ab363af4f6a58078 SHA-256: 35b864baead34b9046dd14433bf0d7c2183b67d6a37ba9330033e545e54d2c5c
156 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, suggesting it's part of an SEO spam or link farm operation designed to drive traffic to potentially malicious sites. The primary URL observed is 'https://soxebez.ru/wix?keyword=estructura+de+lewis+so2', which is likely used to redirect users. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://soxebez.ru/wix?keyword=estructura+de+lewis+so2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5ff92952aa431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475580/normal_60017fa4be601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5ff317076477d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484103/normal_6019768d41b46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_6005e65b17357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5fc7b85f306a1.pdfIn PDF document text
    • https://sukowuxipimo.weebly.com/uploads/1/3/4/3/134318810/a9892ac.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/jb14jbv/dj_song_mixer_software.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5fe4f53c0fa7d.pdfIn PDF document text
    • https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/xuwunasawewelozot.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/xibapozenapalez.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/ecphij3/guess_the_candy_graduation_game_answers.pdfIn PDF document text
    • https://nasuvanebi.weebly.com/uploads/1/3/5/3/135393195/jobimosubi-dasovakuxupiju-padapasuxotujib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489834/normal_603c5ab376427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5fd1bc302a4a2.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/dCbGwCl/vertigo_icd_10_2020.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/992dc8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_601d9e2414275.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fujadabez/barracuda_web_application_firewall_admin_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/metformin_glibenclamide_combination_in_india.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 5116 bytes
SHA-256: 819831307fbd373f0bf6fac0ec20f3b464c85641e4088554b125f1ccdebdb446
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 11572 bytes
SHA-256: 7c1bad5e52995ec1ec0b4c03af251f99aee7a7e95b9e48ce9d79c504fd50151b

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