Malicious PDF — malware analysis report

Static analysis result for SHA-256 028cf8127549d735…

MALICIOUS

PDF

78.6 KB Created: 2021-03-22 15:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e848eeab23b52128da290d3b3d746a5a SHA-1: 57278ad279788350a593c4b13b14962d02266bd5 SHA-256: 028cf8127549d735f8ec3b7be5bdabfc4c6dac90026addf91e813ab0b7d8fb6c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=download+free+instagram+followers+apk PDF link annotation
    • http://summerita.fun/a2_reading_comprehension_exercises_onlinehtrex.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/ib0mCow/72475136687.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/e6icZhc/calendar_2019_printable.pdfIn PDF document text
    • http://cocobuka3.xyz/19785925438bzg40.pdfIn PDF document text
    • http://nubolats.xyz/30154325703go2hn.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/XfvhcAx/baxevutexirakalaxuko.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/1VjhhaY/star_wars_rebels_sequel_show.pdfIn PDF document text
    • https://nakojuxipesasam.weebly.com/uploads/1/3/0/7/130776326/pixigodob_lamowewodep_kuxiranezo.pdfIn PDF document text
    • https://datulexajolibup.weebly.com/uploads/1/3/0/7/130738708/jewob.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/JRifjjo/ruruwikafimuwanokemujed.pdfIn PDF document text
    • http://kalavar.xyz/lidenilu9g8rp.pdfIn PDF document text
    • https://cdn.sqhk.co/liramesot/djhhdUa/bravelands_book_6.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/dipidegebulagip.pdfIn PDF document text
    • https://porujeworor.weebly.com/uploads/1/3/2/8/132814718/faxufadukaxamox-rurunuvatokeg-jozomufini-xibaxujal.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/jbXhd5c/tulavegekofuvezamelo.pdfIn PDF document text
    • http://wordsidepost.top/kenmore_front_load_washer_error_code_leurdzq.pdfIn PDF document text
    • http://idealicaitaly.site/how_to_work_in_agile_methodologyjpeqv.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/7863180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabenikazugaj.rf.gd/what_is_the_importance_of_rangoli_in_indian_culture.pdfIn PDF document text
    • http://validexa.epizy.com/jump_attack_minecraft.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_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5516 bytes
SHA-256: ab4ee537b130b8e3da76d311cd87953aede78f3810bd66ef3129610309786609
font_01_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 11700 bytes
SHA-256: 87487815eaf3945deffc4100f9b5ef7b6899b5f8e2eb534a069be91d8323ad8f

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