Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aec3c617c9b549…

MALICIOUS

PDF

73.9 KB Created: 2021-02-12 15:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fabfcc6f87d33c4ff1b488c6640f8d9a SHA-1: 45c5e6aa378353f1c53e51c91dbb12f738fc21ec SHA-256: a5aec3c617c9b5494f44707011dcbc50686a06d852ba9cac38971d36bb87bc93
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, many of which are hosted on disposable or SEO-focused platforms. This behavior is indicative of a link farm, often used to manipulate search engine rankings or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=sap%20business%20intelligence%20overview%20pdf PDF link annotation
    • http://nemurirewokow.iblogger.org/fodaju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375355/normal_5fee29acd72c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_60229444de9f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483097/normal_5fec340fc5810.pdfIn PDF document text
    • https://fogufapepupol.weebly.com/uploads/1/3/1/8/131871477/4c263.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/tobuk_xupexokuloter_kanozedawoxox_wadaj.pdfIn PDF document text
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/1359662.pdfIn PDF document text
    • https://sudiseva.weebly.com/uploads/1/3/4/4/134470115/nixinez.pdfIn PDF document text
    • https://kilewesiviteki.weebly.com/uploads/1/3/1/1/131163613/8967085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://malakevuxe.epizy.com/california_king_sheet_sets_near_me.pdfIn PDF document text
    • http://fosoxubap.epizy.com/dujimijadugumexuwaxavisu.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/vegetable_spring_rolls_nutrition_information.pdfIn PDF document text
    • http://wuduzukatej.epizy.com/gakuguz.pdfIn PDF document text
    • http://bavabime.rf.gd/80503509500.pdfIn PDF document text
    • http://ninesunugata.epizy.com/birthday_wishes_marathi_sms.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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 5720 bytes
SHA-256: a4ca5e814e874eda3d9caefd1910b250bb23b61400ae342e276b5fb4981a17a4
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 10460 bytes
SHA-256: a4fe8aaf9b8fb0d52dc855901832f3cd9c87b4bebecd37372d173622c37c40c8

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