Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c1e0172ccedcf0…

MALICIOUS

PDF

90.9 KB Created: 2021-05-02 20:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 67fd768854a4a2451d6fa515e474b1f2 SHA-1: 5849a135d1a265c50311463086d7c1b44cffd306 SHA-256: 66c1e0172ccedcf0b88569f0b224f812fdf45e3a5dae76fd1cf1c4095edf6b49
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure itself facilitates the redirection to external sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://druttle.ru/strik?utm_term=motorola+sb6121+surfboard+docsis+3.0+cable+modem+xfinity PDF link annotation
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/gofobesibufibofuwope.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/aibjbY7/56897800515.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/non_exclusive_authority_to_sell.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/jfiby8u/i_wanna_be_trap_adventure_2_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonowuwig/hbHVgc9/super_moist_lemon_cupcake_recipe_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/xojafimib/eojgrfR/17604507353.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/2172732.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/bih7jfo/black_boy_braids_hairstyles_2018.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/naguduwapiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5fd65dadefa3e.pdfIn PDF document text
    • https://cdn.sqhk.co/vonitumefide/5ujwHYr/rush_limbaugh_show_today_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393356/normal_5ff0d6d15538a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_60153e787075d.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/furomopina-mijinowa.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/7815512.pdfIn PDF document text
    • https://wasafigazepez.weebly.com/uploads/1/3/4/5/134586721/dilokujon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5fdd0776edd57.pdfIn PDF document text
    • http://duzixofiwisegi.mygamesonline.org/lufuzelatinamubaxipemekaz.pdfIn PDF document text
    • https://cdn.sqhk.co/fovugemut/doieHih/behavioral_based_interview_questions_and_sample_answers.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://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_3ee70bae9e714462a631d3167547c86d.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_4f6906278809458eb44b9b24da36922d.pdf?index=trueIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/80999582725.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_e0eef48dfc124480869bcd79507652f3.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 6812 bytes
SHA-256: 705a40f2f1299da93398ac562f39fb8e280a7b0d058145836d6dafd55d8ad212
font_01_sfnt_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 6040 bytes
SHA-256: f8d2304ffe54f2360b0395ebb352f77c4ff9e743441e4d8bb77c40a029ac782c
font_02_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 12052 bytes
SHA-256: 436a647c18cd933ab88110ed9c4c902cb461fa913b21a69093de9bffd94b98ac
font_03_sfnt_off00014ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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