Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a0c23675aa4033…

MALICIOUS

PDF

72.3 KB Created: 2021-06-04 22:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cfe2e2831f3408187d74aa285937ba6e SHA-1: 236b3bc7e0f41dd99ea5399433d190ad946d7898 SHA-256: 11a0c23675aa403348a7143ebf51fd424e37244e43d6c179c8b19dde98cd06ff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://dugedepap.ru/123?utm_term=avery+big+tab+dividers+template PDF link annotation
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/92da9092d9ec2.pdfIn PDF document text
    • https://ruvutitijo.weebly.com/uploads/1/3/4/8/134883381/6413138.pdfIn PDF document text
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/silitozevifiv.pdfIn PDF document text
    • https://gexawagezawa.weebly.com/uploads/1/3/2/6/132682787/xupawopuladi.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/b14190aa-7373-490c-89cd-37ba4766c06f/how_to_draw_a_turkey_using_your_hand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f694330-5dd4-47a1-a114-0c8ca308c88f/88284831125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50421c59-c642-468b-bb21-824455ca6f7e/how_much_is_kathie_lee_gifford_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a0a476-f753-4759-8943-548e28bd96f2/1048257338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e57c42a-455a-438e-960b-58cc4e0551a8/unearthed_arcana_5e_feats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd828c35-cc37-4574-9e42-bb787708d93f/have_yourself_a_merry_little_christmas_original_singer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a33ed7-4afb-44e7-8181-265288e7c116/que_significa_tomarse_una_foto_tumblr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787719fd-170b-4df4-8ea0-784237b5b27d/nekudumirivuwemapomekiwog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d9c3dd-e287-47e8-ad94-ac600132a107/9688753037.pdfIn PDF document text
    • http://popuwepux.pbworks.com/f/boreruviponufer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11408808-a9d4-467e-b75b-e0ca87fae225/rilijasusatufaxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd64785-72cf-430e-972a-46d7bef627a0/fezavuwasozalilag.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144523722/15403442422.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/wagedobaleruv.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144427551/neniluj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0e2596-b185-4442-9e25-87df5968c46a/nuxuviged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f8d63d-b8aa-41cd-baed-3dd86b8a61a5/request_letter_format_for_getting_bonafide_certificate_from_college.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fd4e02-ec6b-426c-8219-8f982f0995c9/81653515850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd305577-4211-40aa-9d3f-f7c771d57b14/double_sword_fighting_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f31d4a-a59c-46cf-831a-79c5087909db/26286288150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9196cf-b83d-450d-ac51-ff21af3d244d/86285009992.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_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 5568 bytes
SHA-256: 3fa3b71fa14ee00f32e20f059ffebfb8f7161bfceb1f21dd8d0c46ada1ff3559
font_01_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 11188 bytes
SHA-256: 6aa9f78e8254aff697411f81ae108252a10d366f706752251a0082a5a3a69d76

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