Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6c56873367cebe…

MALICIOUS

PDF

72.7 KB Created: 2020-12-26 23:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: efb4a8c9fe594e7ed3dd8b44afc999bb SHA-1: 7c5302572505c177f015b678f0b00469f8d88ea5 SHA-256: 2b6c56873367cebe944e0b3cb8334938c84ef1e3e817ffea03dfdea46ff15fca
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

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://trafficel.ru/123?utm_term=aisc+hss+section+properties PDF link annotation
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/8534342.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/PSVjiic/wawiwizavovunepasufuwote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fa387ce7d914.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/1947a11bd9324e4.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/4e3bb9e4a544b.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/gigghi5/23102252342.pdfIn PDF document text
    • https://filojekejo.weebly.com/uploads/1/3/4/4/134446685/2531144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f9f9340bc6df.pdfIn PDF document text
    • https://padukasafif.weebly.com/uploads/1/3/4/4/134404544/rupafegopuru.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/gureref.pdfIn PDF document text
    • https://venakadu.weebly.com/uploads/1/3/4/7/134729608/fegoxerubefap-votefem-wimetomozi.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/fudezudubedulo.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/b3bc62a.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/b1cd1c41-8e02-4a81-a876-8fc79ab5b7fe/what_is_the_density_of_the_unknown_liquid_mastering_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836ad27a-b7ed-4d88-8a2d-5e6115d18d59/childrens_sermons_object_lessons_mothers_day.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/caesar_3_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/fuxufasukapudop.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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 4556 bytes
SHA-256: ffcf3a7e4d180f6b0caf63e488175984c09038667d6d65882fab0314ea0aea53
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 11480 bytes
SHA-256: 0569971d716940a4d4844b85bc46277b4adda6ed656a7915caaef93e42210b62
font_02_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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