Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e53a1555690a549…

MALICIOUS

PDF

76.3 KB Created: 2021-05-05 13:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e3694eeff29504f3191603966166cc3c SHA-1: 281ec49d312948b84f1627495b366d5296fa774f SHA-256: 8e53a1555690a54971dcadf77fd65c658035fbbfd55e6bb04d7deb4f45b041a9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm to distribute traffic to various sites, including one with a suspicious URL. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic point towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=sigmund+freud+documentary PDF link annotation
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/4811144.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/263015.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/gi1f3hf/rogikozotajobifapafiramuv.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/milomobuwopomi.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/jiyjeig/calories_in_sheet_cake_with_frosting.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/aMZPghY/younipin_pro_topup_voucher_game_download.pdfIn PDF document text
    • https://tuziroxakitisa.weebly.com/uploads/1/3/4/6/134613497/bafame-mevuxowazejigij-zogixakogonos-foniwujonigako.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/wesezuzuvalirik/bhutanese_karaoke_songs_free.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_7e31570ce361411eb1f7eb957847346c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb876dd-a303-4199-b5a4-0e2bc0097d21/13974002243.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/henry_s_freedom_box_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ad6200-8ac1-4c0b-9b3e-9ec3a038cccc/writing_research_papers_a_complete_guide_15th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e3a815-432c-4f4e-b0a9-85834cbd3b70/8784850164.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_f35f3abb50854171b56f84b9b883155e.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_0f8c6c64306940e4bd3a9b51f8cd2299.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_6978a032659d4f3fb1b424255ea99d52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6139c0da-1b32-4c78-9f69-52b829e8cf32/barijifunafitemapu.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_bfbdc9feb7e44c7d9e1a95a9f2888ae3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec66e64-a4d2-468d-b04f-d9dc6a9c0245/how_to_set_rca_remote_to_lg_tv.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5336 bytes
SHA-256: 7e7beaf47a8c092d13887e25c3da725d5d563dc74a093077f56eda37951234ce
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 11488 bytes
SHA-256: 4a9717c10729ae34b6c4cfb2ae83ad573c966d9e26cd8ceeb42c894e10035a64