Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a04d47572cd509d…

MALICIOUS

PDF

71.2 KB Created: 2021-05-31 23:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4a3471953d423b0b9318e24c529099fb SHA-1: 16dc08ef25d4329202b3f7ba9cde1f1a0973e805 SHA-256: 1a04d47572cd509d4c009c3f87997d253c4d757f51dc07628f0fa7788b176590
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://oniceh.ru/pbw?utm_term=best+virtual+team+icebreakers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc6c67e111f9.pdfIn PDF document text
    • https://pidakobanaxob.weebly.com/uploads/1/3/4/4/134463411/b624608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_60283fcbdb494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_6047115d518db.pdfIn PDF document text
    • https://kiwemedorupa.weebly.com/uploads/1/3/4/4/134446537/pituzojutaj-gibexapekukax-xoxivolebubug-mafub.pdfIn PDF document text
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/893c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_6036aab34e6b2.pdfIn PDF document text
    • https://bokorakalawu.weebly.com/uploads/1/3/4/6/134643693/c3911.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/6458156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_604b2f5597d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491946/normal_6068158f54ccc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144423018/how_do_i_name_my_real_estate_business.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144416004/qualcomm_atheros_ar9285_wireless_network_adapter_windows_10.pdfIn PDF document text
    • http://zepupifob.pbworks.com/f/evida_8gb_digital_voice_recorder_manual.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144420681/faxudefawawosigi.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/72118892847.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/gifford-mcmahon_gm_cryocoolers.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144413982/64946059242.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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 5256 bytes
SHA-256: 17f6fb9271a1cd90aa90be1624898402d0a64a6a57876afbc99ee0521fd8ef97
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 10764 bytes
SHA-256: b545ecfe2a12a448ef82f91b8e80ff5ede687304eca43ced5b4d7c7a9bea6720

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