Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4629c6e6e7a8a8…

MALICIOUS

PDF

104.0 KB Created: 2021-05-05 18:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 124d263df292fbe749698c2603d6aa6d SHA-1: a648b7180df4606adb1832fe18e108be528aae18 SHA-256: 7b4629c6e6e7a8a8c2f3ea2acc51c364189ba72774400dff15aff942e6b620ba
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'Asus x99-a m.2 compatibility', suggesting a lure to trick users into clicking embedded links. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or scam campaign.

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://kuzutuzo.ru/strik?utm_term=asus+x99-a+m.2+compatibility PDF link annotation
    • https://cdn.sqhk.co/ripalufix/JS9M5je/rudivezidutixuwupik.pdfIn PDF document text
    • http://pitasulo.22web.org/25694129689.pdfIn PDF document text
    • http://siluvuxifebul.medianewsonline.com/web_development_project_proposal.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/icjiadl/pro_lightroom_tips_to_learn_spanish.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/28165524803.pdfIn PDF document text
    • http://fukikenikiru.22web.org/nokisep.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/dhFkqid/jufef.pdfIn PDF document text
    • http://xupazekawinan.iblogger.org/jomuzulufafejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_c325d8c7622d4b398f0d9bc346a70751.pdf?index=trueIn PDF document text
    • http://sutexuvidag.myartsonline.com/77265158941.pdfIn PDF document text
    • http://gabatotudam.rf.gd/wenole.pdfIn PDF document text
    • http://ruwijadigov.rf.gd/saxafotagopopudobijom.pdfIn PDF document text
    • http://wominilagovujul.epizy.com/how_to_remove_pimple_spots_from_face_naturally_and_quickly.pdfIn PDF document text
    • http://xerowavu.rf.gd/99417330794.pdfIn PDF document text
    • http://purupuladufuba.rf.gd/bridge_rectification.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/84977313501.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_ae3f98e85ca24116a949f33a4a9b2e43.pdf?index=trueIn PDF document text
    • http://xutenasejubibe.atwebpages.com/wajewevi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8C 5292 bytes
SHA-256: 214292b0946ea68d6eb4f00b861f3546e225633974aabfa1c05ec9a70d9cd8fe
font_01_sfnt_off00015e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9E 11156 bytes
SHA-256: b215113e5164d63583169bb9d4533f08c66febb51b8eaa0dd64bca7f7aeda054
font_02_sfnt_off00018498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18498 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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