Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c37287e961c7283…

MALICIOUS

PDF

77.5 KB Created: 2021-01-25 22:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b08621499cc13de87c314a89930dc0a2 SHA-1: d0bcbf43a056688dff8da12201c4c5c6cab5abc6 SHA-256: 0c37287e961c7283d392903b66a60bfe9f189bace05b8b43417cee8da17c7ecb
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://trafficel.ru/123?utm_term=stream+detective+pikachu' and 'http://guitar.su/nanitezerapadexujibelawo3zu5h.pdf', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly imply malicious intent, likely involving the redirection of users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://trafficel.ru/123?utm_term=stream+detective+pikachu PDF link annotation
    • http://guitar.su/nanitezerapadexujibelawo3zu5h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5fc9513785409.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/f1d3e78e910c1.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/iheume1/samsung_s10e_wallpapers.pdfIn PDF document text
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/2336890.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/052959f88c.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/icqjjic/disneyland_hotel_paris_rooms_pictures.pdfIn PDF document text
    • https://gepogujewo.weebly.com/uploads/1/3/1/3/131382217/7712225.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/gioA9hg/hobby_lobby_store_hours_rochester_mn.pdfIn PDF document text
    • http://jakor.pro/17414095991n46mk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489587/normal_6007d19ca7dd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fcccccd57f9f.pdfIn PDF document text
    • http://paganel.world/mizufixesapbpkri.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/siredoxudot-kinilijabidofut-gobolad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_600b5643d3cb6.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/iidjgji/48749078224.pdfIn PDF document text
    • http://shimano-stradic.ru/422058141772t9ii.pdfIn PDF document text
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/80d2a1a1f18be.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://s3.amazonaws.com/wixamupelinere/cheque_requisition_form_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/pestel_analysis_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/painting_contractor_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/mathway_premium_apk.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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 4996 bytes
SHA-256: 2e4abae0b66e9099059df8f7791e4fed5a0a4d4719ae08f441790aae8e8c6e44
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 11452 bytes
SHA-256: 7462614663c79a73b3364ad09b240a2402ceb96626b83b9ba9942f11034d3168
font_02_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3