Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb8ef2fb1aa30dd…

MALICIOUS

PDF

74.8 KB Created: 2021-03-12 08:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ab92367d7a1d29e71f3d92527bcaf62c SHA-1: a16de6c25bbd488abf0539d8474d5ef5ace0dd42 SHA-256: acb8ef2fb1aa30dd60b6894a9d2b8831f036c33e3092ac29e6e5c4dced27c109
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is fokemale.ru, which is likely used to host phishing content or redirect to further malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=best+battery+jump+starter+australia PDF link annotation
    • https://kosopewoxi.weebly.com/uploads/1/3/5/3/135318270/453c903883e2a2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6005f499e22c5.pdfIn PDF document text
    • https://sudazevoj.weebly.com/uploads/1/3/1/4/131406082/14d1e4.pdfIn PDF document text
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/xumezeninasali.pdfIn PDF document text
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/pilurenupazis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_6040ae913ac43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_5fd91f4ba3f39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/138b8741-7c00-4469-80f5-1b1b4c120e97/polder_kitchen_scale_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/what_are_some_good_survival_foods.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_b6a311f44cd84a0fb172c4d669b8c7b1.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_5ed62f7166dc469daccad1593bf1db68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/airpods_2_battery_life_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e684a494-c3d5-4b01-87b7-8cebbdffc041/panther_digest_inside_huddleston.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebefb3eb-a22a-4271-8285-8a61b891ea17/kagulonisix.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_00a1243fad4d4bc59331862a8de2feb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/pevidezazajimow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9b09c3-fe63-4e4d-9770-d438a56935da/54583705074.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_24cda35d294d4ad58e7340e8300161b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojenozap/everly_brothers_bye_bye_love_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/historia_natural_dela_enfermedad_periodo_post_patogenico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77ba263-a266-4133-9334-008ffcd493b5/96071873469.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_01bbe6c13532481b8ffa2023b7b690d2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 5332 bytes
SHA-256: 8925a32aff1ff9ebdf669f6f99b01cd0e784c3a46507d5629f78332b1d810bbb
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 10428 bytes
SHA-256: 1069b1e79fdc270df13ccebad36873763c1cddfbd405a993d27cdf633b43b0bb