Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b13664845a2bae7…

MALICIOUS

PDF

82.9 KB Created: 2021-03-28 00:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ba14cf42ca306a9a5c4ae7fa30e3f839 SHA-1: d72b1572f8f6ab45b34659b99f69f0f8ca312566 SHA-256: 8b13664845a2bae79d7652d47299856e613eddc4426840b133079c4e62cd7b6b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URL 'https://golowaki.ru/123?utm_term=browser+pc+di+android' is a primary indicator of this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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 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/123?utm_term=browser+pc+di+android PDF link annotation
    • http://eslivdrug.space/91138377694xrzyt.pdfIn PDF document text
    • http://monoga.space/bootstrap_kanban_board_templatebgju0.pdfIn PDF document text
    • http://callup.today/zojirushi_bread_maker_bb_cec20_recipesza9nq.pdfIn PDF document text
    • http://redpandarecycling.com/darkest_dungeon_party_composition_guide4b64r.pdfIn PDF document text
    • http://garugitadow.22web.org/lg_vn170_battery_cover.pdfIn PDF document text
    • http://trelon.fun/the_power_of_positive_thinking_book_review_pptxkmr9.pdfIn PDF document text
    • http://lalashoppen.online/the_monkees_i__m_a_believer_ukulele_chords4j9r3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_601cb13933fa1.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/5757880492c9bd0.pdfIn PDF document text
    • http://btsworld.org/rasuvokugawepunawuxaxigup3lsej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_60203973496b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5feefaf5513cc.pdfIn PDF document text
    • http://kifepivukog.iblogger.org/fugubukipaxakef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5fee211c59c9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6ec25695-14f4-4cf4-972e-3b7014967802/how_to_replace_sta_rite_pool_pump_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b55b3c-6043-411f-9c19-8608605d2922/what_are_the_different_types_of_scatter_plots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bfdfde-32ec-40fb-a6c0-f59ceda2f787/vusuvopujumazofug.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/takozinotidutigevujimufel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f848bf59-2fda-4ff6-a91f-6e23d2dba5f1/61342154842.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/pitusuxubivofitodezedet.pdfIn PDF document text
    • http://talavapupaniv.rf.gd/urdu_to_english_paragraph_translation_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/zijitomasemotivolatosedux.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/fobazapibeki.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/47095700975.pdfIn PDF document text
    • http://bizuwututemi.rf.gd/turakuwasugemirovuluvited.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e906ff0-a1dc-43e4-9046-77d545bb7bd5/foundations_of_algorithms_asu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 4884 bytes
SHA-256: 74667276f353fa046e668bfd085e01716c2bad0137757010c3a9e327f5a3de95
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 10780 bytes
SHA-256: e9584f1304eba70bf40bdb656141d362173a5c9f94ed64ae5185b72d7cdd3912
font_02_sfnt_off00012fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e