Malicious PDF — malware analysis report

Static analysis result for SHA-256 541df9ef4643f3b6…

MALICIOUS

PDF

77.2 KB Created: 2021-05-15 15:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e47164a6426b90ba154092aec5a0c7a9 SHA-1: 99801fea0daafd77bb4d6911108d4341181c8c34 SHA-256: 541df9ef4643f3b68342d7c20253c70f8f9f2712ee415247d7d2ccdf5fe9f309
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=bullies+ben+shapiro+hardcover PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449193/normal_5fe53b8a78799.pdfIn PDF document text
    • http://nobukuxokosiga.mypressonline.com/punctuation_comma_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5ffa348e84689.pdfIn PDF document text
    • http://leledup.mypressonline.com/what_does_the_term_strength_of_character_mean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_78d39e3e124344fa9583dbb20c571a4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/545279f2-8deb-435a-9849-eb5bebab63ac/how_does_whole_foods_order_pickup_work.pdfIn PDF document text
    • http://jugugesazo.myartsonline.com/rifogolorowaxoniko.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_83c974aa7ae346ba88b5d6e37d05e20c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99cf90f3-615c-472e-8ed9-0930c98e4390/what_does_ec_code_mean_on_hot_tub.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_f515fcf62eb54101a9eaeb35fb629d7c.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_497126961523472e8fdd5ed670a1c664.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0577ac3-79d9-4e79-90ef-de4771505c6b/best_data_analytics_software_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538c3b2d-e344-4342-9480-e53f502e4f25/85011958883.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_a781bb41c61b43e78e96e87f958f7f97.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_7571e468a2174311a64da48555e32e6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/491fbdcb-ed28-4896-831d-93fda2da4e82/why_wont_directv_remote_work.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_5c024d75316c40e28b2fab8edc6481b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fc5565-dea1-4655-8483-181e25ae126f/7966913332.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_7be36ea8663943cab9a07e8ce5d80671.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b1b2ed-658f-45bb-ad10-674fb7ad8cd4/92405279921.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_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 5412 bytes
SHA-256: 1478cda177e9da7b80ed61ea4a884deec00e20ee076a32f7231e3b91722979f9
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10648 bytes
SHA-256: 2f9daf422bb41c2d0f5a6ebd440c5d931a83132d36ec6f52a20fad2f8e2b5187