Malicious PDF — malware analysis report

Static analysis result for SHA-256 a654a38c5d7e7762…

MALICIOUS

PDF

86.7 KB Created: 2021-03-01 15:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 795d694ee1496513b049f2543c6f4d8b SHA-1: 36b4693045005d35560141b69c37ed8b4a81906f SHA-256: a654a38c5d7e77628ab967761c0452aa9580b8b681c03828a87b221b05d6a18e
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 links to various domains, many of which are hosted on disposable or suspicious platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=what+education+do+you+need+to+become+a+computer+hardware+engineer PDF link annotation
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/raxesawivokir-porun-koruji.pdfIn PDF document text
    • http://lighttravel-ng.com/jivolazanegozevulophifce.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/7824113.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/94905c05299.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/2491964.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/ajjIahd/nika_revolt_and_role_of_theodora.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/jajjthg/bejeweled_blitz_download_for_android.pdfIn PDF document text
    • http://vinnipoh.fun/peloximumalodutoji0vuvl.pdfIn PDF document text
    • https://rabibenexu.weebly.com/uploads/1/3/5/3/135319922/bf413ad0d020da.pdfIn PDF document text
    • http://winoraama.website/activate_b2_student_s_book_answers2zkme.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/morilimijanch5f9.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/hhhlygh/jams_world_end.pdfIn PDF document text
    • http://uuuuull.space/sonicwall_tz_205_manual2raak.pdfIn PDF document text
    • http://pusaburuku.22web.org/mulejenanutazidaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimusozulub.epizy.com/girel.pdfIn PDF document text
    • http://zizidizukokaruf.epizy.com/5e_barbarian_storm_herald_guide.pdfIn PDF document text
    • http://tefesapebeto.rf.gd/amharic_bible_for_windows.pdfIn PDF document text
    • http://jelemomibupu.rf.gd/visawan.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_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 5624 bytes
SHA-256: 0e778d116d68fd2c1011836359774b4a41b419001ad15c7ddc6b40bced8537fe
font_01_sfnt_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 10692 bytes
SHA-256: d287f72ccbccf7755da5e4334ab938daeed9024253f8ca8b7a6a4a455dbc39de

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