Malicious PDF — malware analysis report

Static analysis result for SHA-256 975ca4cac5d17185…

MALICIOUS

PDF

81.0 KB Created: 2021-02-22 18:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c0f0f54aa05bd577450624030b4b64e7 SHA-1: 3a3c4004e545596df7a8f095fa7d6d36b87514da SHA-256: 975ca4cac5d17185dffee33c168ef7997d88bcbf566b604bd8ab9f8555217932
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect the user to malicious content.

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://maypoin.ru/wix?keyword=printable+pinochle+meld+cheat+sheet PDF link annotation
    • http://falutaburifa.iblogger.org/forunukud.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/d00pmgg/century_21_nyc_closing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_60068f5166629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_601bd02e4475b.pdfIn PDF document text
    • https://kesadoxiluxar.weebly.com/uploads/1/3/5/9/135974677/ba42108e.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/Fjhgfjg/40020701427.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/0be00ab81.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/xadex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_602230c0785fa.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/2db2851c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470408/normal_5fca9c03cfe2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_60278658463e9.pdfIn PDF document text
    • http://loxokunetuladi.66ghz.com/american_visa_lottery_2018_form.pdfIn PDF document text
    • http://megivisu.22web.org/belly_up_meaning_in_hindi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_60281aabc539c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezegorev.epizy.com/2014_chevrolet_malibu_service_manual.pdfIn PDF document text
    • http://matezule.rf.gd/79004318769.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_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 5456 bytes
SHA-256: 83870bed4d6271b6a4541e84a20fd29dd98e17f1448acf21af6ad11a07bbb322
font_01_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10736 bytes
SHA-256: ab05bc28821fc56ef02d9bf4caa84419f85034f6e6fef0cef8a2a2320f0b7302

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