Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bd0eff63de11ff…

MALICIOUS

PDF

74.7 KB Created: 2021-04-24 01:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8cdace7b665a6fd798f79c26fec946ab SHA-1: 1a234666d763d899b5c6fcf7f936ec51fc79a010 SHA-256: f4bd0eff63de11ff187995e85d6977403327f9d8846b4638f21d5be3778f9a91
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 0.9997

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://vilenefex.ru/strik?utm_term=what+to+do+when+your+kindle+won%2527t+connect+to+wifi PDF link annotation
    • https://zudomizat.weebly.com/uploads/1/3/5/3/135308615/fetuzufumi_muxivurunife_difofifoxosuwun_zovobikine.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/hhghhaf/bloomsburg_university_football_coaches.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/4587111.pdfIn PDF document text
    • https://bevamiwe.weebly.com/uploads/1/3/0/7/130739198/1530945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_601fb81486faf.pdfIn PDF document text
    • https://dovidememalow.weebly.com/uploads/1/3/4/6/134601329/xalupifi_fiwirefek.pdfIn PDF document text
    • https://cdn.sqhk.co/favejofu/SZhiiaR/pidaz.pdfIn PDF document text
    • https://vaxujorukub.weebly.com/uploads/1/3/1/0/131070318/xomevakatu.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/kododuxuxevafex.pdfIn PDF document text
    • https://gagetagij.weebly.com/uploads/1/3/2/6/132695244/dorinewepoxabaran.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/movuvuwumaxolarem.pdfIn PDF document text
    • https://worofinuwur.weebly.com/uploads/1/3/4/5/134582463/xobefonifofaz-rafonabemez-dugemiva-pakikumij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_6033fcd2b80f6.pdfIn PDF document text
    • https://xuserufibizu.weebly.com/uploads/1/3/4/1/134131258/piperi_sifesodunu_fowipowawolapir.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/06a6ea7f.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/njijjie/14253359369.pdfIn PDF document text
    • https://nixifekenebuj.weebly.com/uploads/1/3/0/7/130775280/vagojono.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/gdidjgH/bsava_manual_of_psittacine_birds.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/TChgibz/38689840390.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/19._5_angle_relationships_in_circles_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/cambridge_english_young_learners.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_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 5236 bytes
SHA-256: 24e30a31bc47c2cd662765f4984610982747bb4c258bdc3424f4b4a0e90f5ca4
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 10816 bytes
SHA-256: 5f8204e98ca95e29c0d91f85162b4053eef144291221d121c07afc31be61b7b5

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