Malicious PDF — malware analysis report

Static analysis result for SHA-256 433cd026e56e48f4…

MALICIOUS

PDF

71.5 KB Created: 2021-06-09 06:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e94de99b9c2d10a1dbfe8db85cb752da SHA-1: 398f56abb9b298c884d76d041d8a2772a81769cb SHA-256: 433cd026e56e48f4c7e22fdd860be664590254c8a58bd8e29c2191afc3885cd2
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 0.9998

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://inwebjor.ru/pbw?utm_term=unravel+piano+sheet+music+free PDF link annotation
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/9495394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414358/normal_600450262d813.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/kizujomotebo-jagivuzozuvelud-nonovusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_600cdf51a5c04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487632/normal_6004717a33c2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474987/normal_5fcb16cbbd937.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/feludolemami-zuteboj.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/3f025678f33e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_604500e575275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_604da9164779b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bijinim.pbworks.com/f/cod_infinite_warfare_zombies_cheats_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a118d7c9-4a26-4efc-a6eb-8650c30113da/how_to_write_a_concluding_paragraph_for_a_compare_and_contrast_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602b809d-a651-4283-b7e0-f64567bd21aa/61377872366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a43909-4e78-4c05-bd98-e1d3c6d83123/64543077481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ed8c7b-7e61-4acf-a865-5e7584a6cf03/is_vanessa_hudgens_in_in_the_heights_movie.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144413640/24103315903.pdfIn PDF document text
    • http://sulegiwi.pbworks.com/w/file/fetch/144914106/imperial_guard_codex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8087af50-efa8-490f-ac0e-c6a3b6368df5/danby_portable_dishwasher_ddw621wdb_manual.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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 5308 bytes
SHA-256: b73e2d222ce41558bbc213fad1efc9fc2c4dd75ad62698484d1a4706921e891b
font_01_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 10736 bytes
SHA-256: 48d05c7706936171171d62e8284f88e516a7eeb8e7e31a20379518d260326619

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