Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab95652c922c7d4…

MALICIOUS

PDF

72.1 KB Created: 2021-04-25 08:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2a6ed11ed6be7f9028668406c8171edf SHA-1: d66e43099a95496f632d3355839017088655c8fa SHA-256: 7ab95652c922c7d471d4e3e2c8a7a6a436634a1573517b91bb704e641dc38ebf
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this file as malicious. The document body, though heavily obfuscated, suggests a lure for free downloads, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=free+download+side+by+side+book+1+audio+files In PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/wubozoloxig_fusazom_rotejikiromogog_vonoxumoxaw.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/zosiwu.pdfIn PDF document text
    • http://metazoaapc.fun/historical_development_of_remote_sensing_technology0rk4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480402/normal_5fd79d1ae3820.pdfIn PDF document text
    • http://leyloften.online/christian_names_with_meaningvvd0x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fe41410b6c7e.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/dell_latitude_3400_specs.pdfIn PDF document text
    • https://valuzobuxile.weebly.com/uploads/1/3/2/7/132711949/3027331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_60276c495687c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_60206f4684d06.pdfIn PDF document text
    • https://fadusibolene.weebly.com/uploads/1/3/4/0/134042843/gexudev-piduseg-zotudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_37e6462d76804a8f9a0da65a6dc36a5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78778d46-2d9d-43cc-a5fe-82999ee726ef/how_much_does_lockout_service_cost.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/nimefabibutezowab.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/cambridge_primary_mathematics_stage_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f501880c-57fc-4ac7-9a68-f739e5b911f9/epson_3020_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490bf978-2e38-401a-a5b5-9e95bc603d79/mechanics_of_materials_beer_6th_edition_solutions_manual_slideshare.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_968eee7012554ec798496f6ab653c742.pdf?index=trueIn 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 5304 bytes
SHA-256: faff3af88d2a37569e4318dcf98bcb1e35df28ded7bf28a41ac3adaeb2125e2c
font_01_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 10392 bytes
SHA-256: 417a4c1deebbffac96b5036e94fe367f78ff8c9941bd351fc8bd084366c582e7

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