Malicious PDF — malware analysis report

Static analysis result for SHA-256 3184abe343a0ff7d…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 00:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 691a2068d73b00f61a06f0770b518bc2 SHA-1: dafca834823f0ec78b0258db9d3e043f2c62fb6e SHA-256: 3184abe343a0ff7d57f6f1cee67f093f6b7c65be00b32a2707f4795455827f1d
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://pelibifir.ru/strik?utm_term=how+do+i+clear+the+descale+message+on+my+keurig+duo PDF link annotation
    • https://cdn.sqhk.co/gagunewatevo/MZXih7l/tajegubibovaperubotal.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/45f8b03de8d3f.pdfIn PDF document text
    • http://torchqbfl.fun/3410394783e7axq.pdfIn PDF document text
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/fosasoxemewiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411231/normal_6004e193a8802.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/iamNohf/cuso_international_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_605b1846823cf.pdfIn PDF document text
    • http://item-mask.top/ethernet_cable_crimping_guide88lpp.pdfIn PDF document text
    • http://extraevents.ru/lizavadobaputaveja33lcj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_5feede9782075.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/he0hcib/darkness_rises_pc_indir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476566/normal_5fd065ad31b4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_d883dff1c34d4115a7183dacba950a2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/brain_teaser_pc_games.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_d1a1a33c1c5a4aef99b69964d5434bf0.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_54069462fbf54c94a98f9497b39b0478.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_dc70963facd54860b13bab8e4a084816.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_9e96bc877e8643b7953d9df91f93a385.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/amma_letter_images.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_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 5572 bytes
SHA-256: 963a5f74b6b5846a8fd712d94d14ebc1c877778460b7c6528b48cbbb64a97fb2
font_01_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 10864 bytes
SHA-256: 8bbbe614fff86482871f9625a50838406cce41d0927736a5bc6ca14b90234ab7

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