Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ba3b505740ca69…

MALICIOUS

PDF

84.1 KB Created: 2021-02-20 03:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 795b26de8dcd1f35db6e827350947ec3 SHA-1: 2f1477d26b6e4edc801661d2e7ec8162f140ab28 SHA-256: 73ba3b505740ca69a42292ea735bd6da19627a78d2c5750fef46e5418a870216
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many pointing to disposable domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm structure, and the presence of external URIs suggests an attempt to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/123?utm_term=can+i+play+metal+gear+solid+4+on+ps4 PDF link annotation
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/wuwabexibuviri_zajuri.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/YAkjbPH/little_baby_bum_nursery_rhymes_list.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/iidyigt/bimanitojav.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/dC8Lm6T/build_a_bear_locations_in_tennessee.pdfIn PDF document text
    • http://flipping-car.online/reading_practice_test_5_answersnnr7n.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/iaihXhe/dragon_age_inquisition_haven_battle_music.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/wakalipos-bozudowal.pdfIn PDF document text
    • http://vopibuxipem.22web.org/57730835180.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/du5jeha/virtual_barber_shop_3d_mp3_download.pdfIn PDF document text
    • http://spindlndou.space/83957800364usdnq.pdfIn PDF document text
    • http://c-advance.space/sipoc_templates_excelabvzk.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/63l4tpr/3252319557.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/g59Qr2H/awesome_tanks_2_hacked_unblocked_66.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/Hgdjbv0/vajudogafitaziv.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/9cac1.pdfIn PDF document text
    • https://nojonepidafajik.weebly.com/uploads/1/3/0/7/130775859/butoronu.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/hcAbm1n/juxuxutowugokotoxevaxed.pdfIn PDF document text
    • https://jusisobopat.weebly.com/uploads/1/3/4/3/134326654/3904269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kinutumuzikuji.epizy.com/damoniteniz.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/miscellaneous_award_pay_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/chinna_chinna_malai_song_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/loregolazidi.pdfIn PDF document text
    • http://saveluvuwu.rf.gd/12922943807.pdfIn PDF document text
    • http://dipozarevew.epizy.com/59728690196.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/85443880206.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_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 5372 bytes
SHA-256: ee7907c1f9094a86f9ab084fd6d5b7ea4e5fb14c12c4f6c20502a22587d3fd1e
font_01_sfnt_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 12040 bytes
SHA-256: c9a3c7883595a952efc1280154f48cddb1975a29b144dd889433a0187efba149