Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ceb8b3f2bc2efe…

MALICIOUS

PDF

61.3 KB Created: 2020-11-12 23:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 606b543056d30c7db5b1b83edba8afd2 SHA-1: 149c744c20594ca71471508ada4a8ee09a246554 SHA-256: 09ceb8b3f2bc2efef67e800bf972c892d0e451f9a4f4ea07984f88071a1109ad
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a malicious image-only lure, typical of phishing campaigns. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content or further stages of an attack. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 61 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://trafffi.ru/123?utm_term=emerson+unidrive+sp+3403+manual PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/0c18874847f.pdfIn PDF document text
    • https://fedijukesubi.weebly.com/uploads/1/3/4/6/134600597/3612137.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdfIn PDF document text
    • https://jumosoguwakebak.weebly.com/uploads/1/3/4/5/134588816/9522519.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/4c5a2c816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_5fa44abdf0448.pdfIn PDF document text
    • https://koworuvixoduto.weebly.com/uploads/1/3/4/3/134352933/096a002128a1.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/3810973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc6d0b9-e80e-4ed3-a1df-18f8e2c3c782/la_soupe_aux_choux_streaming_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/hari_arora_applied_mathematics_3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/beps_actions_8-_10.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/784679883.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_off0000bbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 5516 bytes
SHA-256: 0b6ab1a177cedfb111acbcfa7c96c6b127c3ab687dfb0554110840d187e8145e
font_01_sfnt_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 7728 bytes
SHA-256: ff3af67655ae2f80bfbcb3152d48929d2337cfcf37e9fb3f57243632b0586dce

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