Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d501b58e8bea05…

MALICIOUS

PDF

77.1 KB Created: 2021-01-11 19:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 047ef82a1c65874babae4367e0f54810 SHA-1: 78158d7fc86332fb6747aa18dc95c7bb1659565b SHA-256: 97d501b58e8bea0525d2fe2f74978d8968458a78aa0064507b0c55062e008dec
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=70+inch+tv+wall+mount PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5fc342d746f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/hbi09ig/68465368724.pdfIn PDF document text
    • https://nimimemuxigu.weebly.com/uploads/1/3/4/4/134488465/tovivag-tojimaloxipu.pdfIn PDF document text
    • https://fipokotosa.weebly.com/uploads/1/3/4/5/134506619/pumugokevozamosew.pdfIn PDF document text
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/026b3dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5fa85a0f23545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_5f96425d16850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_5fe7edb7bf992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5fe798769ba14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_5fa4676de8512.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/xifid_dakakezinetuti_fixabunu_tujoramodewusos.pdfIn PDF document text
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/dazalovu.pdfIn PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/4471633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f8b1e70b3b97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 5044 bytes
SHA-256: 9051f7d37e2e29a43c406d73564484202189ff74237a4c45c5f62748180cf830
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 10952 bytes
SHA-256: 828f497343ca845439974821191256df77e2d9caf4033fc2333f1df9196e0602

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