Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff60b091b6113acd…

MALICIOUS

PDF

70.4 KB Created: 2021-02-14 06:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e8fa326cb37101a1989f76511d4e94a3 SHA-1: 7d05d4e488227455d13c60e0235e3d4f47416015 SHA-256: ff60b091b6113acd501ed83aaaccba9e3b00db14196b6feb5720756ad63241e7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://bologen.ru/aws?utm_term=habibie+ainun+2++movie', suggests a lure related to a movie. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

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://bologen.ru/aws?utm_term=habibie+ainun+2++movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461746/normal_5fd661b49b015.pdfIn PDF document text
    • https://cdn.sqhk.co/disanefamu/iiJgijd/best_wallpapers_for_samsung_tablet.pdfIn PDF document text
    • https://mufaguzesevulet.weebly.com/uploads/1/3/2/8/132814956/9205019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_5fda392c66902.pdfIn PDF document text
    • https://cdn.sqhk.co/rowofabuf/iiibcqU/nexot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_601e02c773596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_60180c2d813a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_601b401863cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_600f15ed71b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_601a053d7fb61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424645/normal_6002e07d09721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_5fd90a203fdff.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/jasadilurixoruguwos.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/ririxabilose-xedopop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466143/normal_5fe2f7a76aff5.pdfIn PDF document text
    • https://fivefijoxiwu.weebly.com/uploads/1/3/1/4/131453543/rumakugaserovobowan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_60145452c1968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wajibile/california_fish_grill_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/difference_between_financial_statement_and_audit_report.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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 4816 bytes
SHA-256: 204abfbbdfd6393d58b8e3c5985a69d19ac65bbf10f1b044da75b17945a39798
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 11024 bytes
SHA-256: 5e7d2047a66626d9df6b2fa3e80e119b287d79b2102e5cf6af8076857cd8df58

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