Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ba165807810daf…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 21:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 414ff049bf14163d04d19cb2f278e4f5 SHA-1: 1465fb74e629bfe695a98ceaea4007e1da1d58aa SHA-256: 69ba165807810daf8224faf5f54fc24c7cf91068db14f449ed4a84eb6ddc635a
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 of which point to disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL and the nature of the link farm suggest an attempt to drive traffic to malicious or ad-heavy websites.

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/123?utm_term=bollywood+songs++320kbps+pagalworld PDF link annotation
    • http://kobazugipodiv.medianewsonline.com/40380632851.pdfIn PDF document text
    • http://momarivido.mypressonline.com/the_wave_painting_japanese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_5fe9ddd11a667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_605a2dc90b41d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_602f70b42b997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484093/normal_6004ae883e76f.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/6134646d-b4c3-46b5-8d4d-2be6f798b94b/gemedubad.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_8846c51f8789405f96d53469082aaef5.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_1c182b8ff5a2423d9a9ed7dc3e518327.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/wisoxagibawitagone.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/civilization_iv_beyond_the_sword_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce67062b-0b41-4e27-a720-90b854f9fa94/75025368403.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/lomizuluruwabaxinis.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/ways_to_prepare_for_interview_questions.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_5669bc92edeb42b1b9bb99f0e00d59b2.pdf?index=trueIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_5e453b1afe0e4b3d88ab07adbbf7222f.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_ba4d8bf9cfaf43bbb2c444a575cf54d4.pdf?index=trueIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_bdcc6b5b160546c59b079da32ed8f30b.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_5f745cc86b8c4a2aa0f242a81b7261d4.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_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 6012 bytes
SHA-256: f3509783ac2c7f1687e8f1d3cc2e93e06289ff8f1c982a1a73df961fc92eb37f
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10624 bytes
SHA-256: 4daea2876e77856c0f89da07975c74db2409a5f07329880548dc8628625f9b3d