Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f20734b715aaaa…

MALICIOUS

PDF

74.4 KB Created: 2021-03-25 04:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93f5a14ad20c9da51679ffa9ffb25617 SHA-1: 74ccd52e1160ead0b24f61b92a23cf381564f9d8 SHA-256: 83f20734b715aaaabc10ba55de7f584d534d95db3c07277e2800ebfba7876f87
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one identified as a potential malicious URL (vilenefex.ru). The PDF_SEO_LINK_FARM heuristic indicates a large number of links, suggesting a link farm or redirection scheme. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/aws?utm_term=how+to+clean+a+rowenta+iron+with+vinegar
    • http://xexobifu.22web.org/2936411548.pdf
    • http://rozujed.sportsontheweb.net/thank_you_reply_email_for_appreciation_sample.pdf
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/8ec868003.pdf
    • http://tunewejewuz.mypressonline.com/vezixatunopolokadire.pdf
    • http://wuvozikeximufuk.iblogger.org/istqb_foundation_guide.pdf
    • http://pagavopalubutu.scienceontheweb.net/pioneer_elite_television_speakers.pdf
    • https://kijujula.weebly.com/uploads/1/3/4/7/134756294/19f7915589b.pdf
    • http://jezapaditasas.22web.org/86029183386.pdf
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/39979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d27fa138-6e7c-400e-b4de-9bea660757e2/84128130407.pdf
    • https://uploads.strikinglycdn.com/files/cdcc0d44-7bf7-4fe4-b606-95f06ebaf2b1/62176265112.pdf
    • https://uploads.strikinglycdn.com/files/0de45c15-8fe4-4db9-8070-46e9ef664878/heart_of_darkness_part_1_and_2_summary.pdf
    • https://s3.amazonaws.com/zerejibixupav/keto_diet_on_a_budget_-_low_carb_ketogenic_meal_plan.pdf
    • http://jejivosijej.rf.gd/48435312440.pdf
    • http://zafokofebub.epizy.com/92680512801.pdf
    • https://uploads.strikinglycdn.com/files/96dc5cd4-a4f7-4944-800c-6c1e931d8d9d/art_pro_mpa_manual.pdf
    • https://s3.amazonaws.com/woxewiwupir/exercices_atomistique_s1.pdf
    • http://baxodivol.rf.gd/titotozuluroja.pdf
    • http://muguvap.epizy.com/51512475278.pdf
    • https://uploads.strikinglycdn.com/files/165ab0f6-92a9-438c-941e-8e8ee944ca42/lavodoseja.pdf
    • http://femagela.myartsonline.com/zijizadulaxusumolosuruxe.pdf
    • 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_off0000e6d9.bin
c56a2203a99f67429fd2ed44bd8b0f7b23a59184896a11c9d5651d56eeec5514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 4996 bytes
font_01_sfnt_off0000f7ec.bin
807638aa608a66c6a8e861521ea305a2c17964be93f9228214d92c64b7a93a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 10856 bytes

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