Malicious PDF — malware analysis report

Static analysis result for SHA-256 9261d972bc025d4e…

MALICIOUS

PDF

77.7 KB Created: 2020-12-30 11:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cd9e5ef20f7a708908b40aa0cf0eab1a SHA-1: 857b1e57254e43f4b826ae07e30e9683dbde9d48 SHA-256: 9261d972bc025d4e382de202a25025e33e209cad734b7edf3c47ae7eb0acc2d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or phishing sites, aligning with the 'Spearphishing Attachment' technique. The ML classifier and ClamAV detection further support its malicious nature.

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://traffking.ru/123?utm_term=alchemy+tour+shoreline+set+times PDF link annotation
    • https://cdn.sqhk.co/forokuxodel/hajbifG/wuwosufoleledejipe.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/libifek.pdfIn PDF document text
    • https://rovewavulitomu.weebly.com/uploads/1/3/0/8/130873995/nubupubazota.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/jLeghjf/assistant_principal_interview_questions_nsw.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/ihfFic1/35007234435.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hgSHngc/heart_pump_model_project.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/ihos6wV/most_wanted_free_download_full_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/UDKTjUU/39682575637.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/wurogopijeza.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/lEicITR/kavotoderazadokodi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_5fc67c5ecd8ef.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/dimemijifejemi_taraxikudarep.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/1311833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_5fc25a57a8cb0.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/nilititonawafim/luzuvig.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/57319982440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119dae93-6b89-47b1-b84d-1066a1ebe686/4235100860.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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 4804 bytes
SHA-256: 5a5b95d4c495b504c04c631bd2f1790d4a2d7e403124982107ffdb0c45539cb4
font_01_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 11100 bytes
SHA-256: 853f6488f93739cace36bedd81df00035d4b513cd0e4d93a6760f5603da62c75
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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