Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87892b3c7184a3d…

MALICIOUS

PDF

77.0 KB Created: 2021-06-08 00:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e77cb3aff17b13ce534eddad5188410 SHA-1: c6a7cf7104fc7d4947ee829bdfddb25b9c2eb7c4 SHA-256: d87892b3c7184a3d6033c79620a0c0fd4ba8a8fdfe4abf5e3799467fe4ab8647
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or exploitation.

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
  • 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://queure.ru/pbw?utm_term=what+is+inductive+and+deductive+method+of+teaching+grammar
    • https://cdn-cms.f-static.net/uploads/4485457/normal_6034110d67068.pdf
    • https://bubemufebe.weebly.com/uploads/1/3/4/4/134470009/fediwopebefa_lulosogijebo_kotenemulopo.pdf
    • https://cdn-cms.f-static.net/uploads/4475997/normal_60696a0297c77.pdf
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/botewose.pdf
    • https://cdn-cms.f-static.net/uploads/4404296/normal_6043b7a300a51.pdf
    • https://static.s123-cdn-static.com/uploads/4392853/normal_5ff80e63c765f.pdf
    • https://purolitawi.weebly.com/uploads/1/3/4/8/134894903/roxuwutosowuxe-bupawomid-jufipalaleropuj.pdf
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/zeravusu-zusiwajizuron-buxumejimopoku-difizupi.pdf
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5fc9ebb6b8f0b.pdf
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ffc1b5204925.pdf
    • https://siridadujaxata.weebly.com/uploads/1/3/0/9/130969300/suxiditidogilofasul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://niluputevi.pbworks.com/f/dual_core_fixer_download.pdf
    • https://uploads.strikinglycdn.com/files/16fed5d3-6223-44aa-9804-8a725014baf3/david_deangelo_77_laws.pdf
    • http://lezakoliz.pbworks.com/w/file/fetch/144721602/my_singing_monsters_hack_no_human_verification_no_survey_no_download.pdf
    • https://uploads.strikinglycdn.com/files/9727474a-f5f2-4f63-bd0b-f62afb3f7fd8/pmdg_747-8_crack_p3dv4.pdf
    • http://bujolajoxek.pbworks.com/w/file/fetch/144575286/what_is_the_order_of_the_books_diary_of_a_wimpy_kid.pdf
    • http://tusawijer.pbworks.com/f/89081473100.pdf
    • https://uploads.strikinglycdn.com/files/0d857fd5-bbd6-442e-b523-6b20f5e46185/widopu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed17.bin
46e5a4b2b41b866bd0de2dd0a3a937648ad3eb3a41ab8e08ad144ec3ebe28b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5476 bytes
font_01_sfnt_off0000ffa1.bin
15bd1f8fc1627a514f29213af1237887fb854f24994a75cf1cc57bc574f832e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10844 bytes

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