Malicious PDF — malware analysis report

Static analysis result for SHA-256 3686b55c3f1acf38…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 15:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddcffd5085c65ca93602880907522313 SHA-1: ed553ecfc9932b0295c8a3b851b7de1a5870f156 SHA-256: 3686b55c3f1acf386a4f7db4e2735fd089bfd8670a6e437c9ce382c0ebf3663e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous external PDF links hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/award?keyword=the+way+up+to+heaven+francais+pdf
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/08ba6219a2a.pdf
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/bakanigolekabe.pdf
    • http://potawuzaj.medianewsonline.com/85450128378.pdf
    • https://pisubudanumiz.weebly.com/uploads/1/3/0/8/130874058/263f5a56901.pdf
    • http://hookup681.site/aptitude_test_question_paper0mnl7.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_6031ee7ba72d9.pdf
    • https://cdn-cms.f-static.net/uploads/4491159/normal_5fd672096b38b.pdf
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/65d3146b4.pdf
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/gidodekiwenoka.pdf
    • http://online-bestshop.xyz/ejercicios_resueltos_funciones_del_lsp71l.pdf
    • https://tupetemen.weebly.com/uploads/1/3/0/7/130738754/wozoxogewujoku-toduwufus-sorerazaxatewid.pdf
    • https://wuwemupijebuvat.weebly.com/uploads/1/3/4/0/134012408/ae912c70f75cf29.pdf
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/8388408.pdf
    • http://detonic-official.website/vupowepopatigumiduduvikr77o.pdf
    • http://galosidijixiwu.mypressonline.com/car_sales_contract.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tezofuretejom/tecnologa_de_la_informacin_definicion_informatica.pdf
    • https://s3.amazonaws.com/fatikonavori/nixogawexu.pdf
    • https://s3.amazonaws.com/fekife/how_to_make_microsoft_word_dark_mode_windows.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_off0000ede4.bin
02627f655d53655eb066eb50b8a74d950275a38e2ab296b31d026640e8918c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 5412 bytes
font_01_sfnt_off00010069.bin
b356940cced25f71f78c4b4541c26131e10f4a23bafdf1f7d5612ad2324bac42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 10908 bytes

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