Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6004a63c0e77ebe…

MALICIOUS

PDF

72.7 KB Created: 2021-02-21 10:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3bf2f39d22ac3a2767a8a0ad98d5aa74 SHA-1: cdbfbe7488b7412f81da6c6cfab1054c58d2e035 SHA-256: a6004a63c0e77ebeba137b8b463ad5cc002587bb79264ccb16a476c859362b87
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=inquiry+into+life+sylvia+mader+pdf PDF link annotation
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/vobon_zosizikazo_xoxemumoror.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5ffcd2b10d39d.pdfIn PDF document text
    • http://generalmassage.online/bitter_gourd_images_freeo4sv4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_5fe882b28db5e.pdfIn PDF document text
    • http://salonop.xyz/zileruferubuvidimafiwigikqbud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_600a90b140c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60210c6c262bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_60178367ab70d.pdfIn PDF document text
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/wubetuxotebib-wupejuromu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_60050f99b978c.pdfIn PDF document text
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/wefibusijatisa-posufude-fediwem-lazogufir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_60249819926b1.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/kelukakeb/hp_laserjet_m1136_mfp_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/adblock_uc_browser_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/dj_bongo_mix_2019.pdfIn PDF document text
    • http://meladuk.rf.gd/logomuxazu.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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 5412 bytes
SHA-256: 69ba0b69ae85f0d00f366b3d9bee60e0ea8a923ad9eea485cc43aed0c93cc252
font_01_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 10368 bytes
SHA-256: 56fdb25351431970ce27ad33ba467fd72105309187342c2d62ee7893bbd44ada

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