Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fd9c6b9d55db7d…

MALICIOUS

PDF

77.4 KB Created: 2021-06-07 05:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: affd1c977c698f976fc5792e8275e65e SHA-1: 5638621b6df200b13281ee067f4b2991b7899de6 SHA-256: 39fd9c6b9d55db7dd0c0bbb5b9240db951c4630d91f16bd0bb7f325f3a266954
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, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites.

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://ketchas.ru/pbw?utm_term=factory+reset+iphone+6s+plus+with+itunes PDF link annotation
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/nasugakugakolutilip.pdfIn PDF document text
    • https://kekipefawaro.weebly.com/uploads/1/3/4/5/134588225/8908130.pdfIn PDF document text
    • https://voradirara.weebly.com/uploads/1/3/4/7/134744625/3666675.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/1640116.pdfIn PDF document text
    • https://rozusuwiloguf.weebly.com/uploads/1/3/4/6/134644861/lumuvijemurer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_601e61cb57619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_6069c9691563f.pdfIn PDF document text
    • https://vunemagerubu.weebly.com/uploads/1/3/4/5/134525741/f88e85.pdfIn PDF document text
    • https://sovinupuni.weebly.com/uploads/1/3/4/7/134762808/819e39b6223.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/9772290.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/5073125.pdfIn PDF document text
    • https://sazofezobixana.weebly.com/uploads/1/3/4/5/134524546/5559431.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/5e3cdeeb-6a8c-4f5a-b3e1-11f0d8ee8c12/husqvarna_450_rancher_vs_450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dddad0a-026f-43c9-a90d-6b287f1e17b6/how_long_to_cook_sweet_potatoes_on_skillet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c53bbf-77b9-485b-a09c-39f22b0ae934/94041684197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e871120-b0ab-4026-8495-2d4d2bf40e2e/287839317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ee5295-e9b6-4d50-9d5e-0dcce64e50f7/what_is_dean_butler_doing_now.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_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 5324 bytes
SHA-256: 247f5d7c6d427f4d313d41f3e6ad18331e7983ae8d15f9b8303a8e806f975080
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10620 bytes
SHA-256: b09633d62d97cf756946ec8be2300585a9061a39fd3db84e05e6778bb3454a19

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