Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c77debfd76a3de…

MALICIOUS

PDF

81.7 KB Created: 2021-04-03 15:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1ff6c0bd8c3314b6189e7c395b3c2e1a SHA-1: 1bb45b8b88dae7fc868410b9702928f033f448c1 SHA-256: 39c77debfd76a3de5b258d78499bc6708298cb3a23d7a43f0516912505f02a63
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting, strongly suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing text that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=tanner+during+colonial+times PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428033/normal_5ff5ac699c366.pdfIn PDF document text
    • http://vobosivadujilep.22web.org/sherlock_holmes_ton_tp.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/0a724b163ccc202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5ffe537ac907f.pdfIn PDF document text
    • http://koxokolafobim.iblogger.org/electronics_and_communication_engineering_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_5fd9cbcd83354.pdfIn PDF document text
    • https://sivirezu.weebly.com/uploads/1/3/4/4/134445297/5c8b18838a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_604189555fbf9.pdfIn PDF document text
    • http://junebojano.iblogger.org/47756235343.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wavedada.epizy.com/70820462239.pdfIn PDF document text
    • http://lodagid.epizy.com/banking_financial_terms.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/rotawatudanafutalodulo.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/nedekedujumegapozon.pdfIn PDF document text
    • http://zodesozagusi.rf.gd/98111359333.pdfIn PDF document text
    • http://sogefotatuledis.epizy.com/zatejupo.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/61558893819.pdfIn PDF document text
    • http://venavabumekaj.epizy.com/nizagedizaguwudarezonudet.pdfIn PDF document text
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_734614941f2e4e298be1f69fba804cfd.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_879226ca4a8a4c6485563a17a32a09d7.pdf?index=trueIn PDF document text
    • http://vajezozaxapom.rf.gd/2005_jeep_grand_cherokee_wk_lift_kit.pdfIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_780b84bab9ee4407908a0c868c4378b2.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_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 5208 bytes
SHA-256: 59cab2614f1837d1dc056a0e492b77e6443d1e6da988c6c2314b7141edc7480b
font_01_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 11192 bytes
SHA-256: 4a0b7a5bf0b5e27bb026ae19a25e5a02039e862e322e409cc7c06e5a1bd9b975

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