Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f3e1f8a0fa6978…

MALICIOUS

PDF

76.2 KB Created: 2021-06-09 07:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a180b58ca6c803be7a5255af86c40b2d SHA-1: b6ee5f479183cabf4f2c60fc0047d63bb472d9a9 SHA-256: 66f3e1f8a0fa69782a70419c67232b4a9a69cdcf6cd8fda4be393e5d483af01d
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 pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/pbw?utm_term=energy+change+in+endothermic+reaction PDF link annotation
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/xunevobidiva-lekopujevab-vanulavupufama-miluladajenurip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_5fdbd51c0b602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_60556ea87760c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_60334156ef7ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_5fd895b74b032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_601bfe8587eab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_5fc889ade73d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_602e2a25a6018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_5fd646fd403f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fe993a925a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_603b306351234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_600b69dd24ecf.pdfIn PDF document text
    • https://kubikimo.weebly.com/uploads/1/3/5/3/135393209/jinojalanasiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_603decd714662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_60099618034cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144905910/tamilgun_new_hd_movie_download.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/65911747341.pdfIn PDF document text
    • http://nitezug.pbworks.com/w/file/fetch/144891762/limbo_apk_free.pdfIn PDF document text
    • http://bekojifutok.pbworks.com/w/file/fetch/144784155/kapov.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144728688/new_punjabi_song_black_background.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/what_group_of_organisms_use_cellular_respiration_in_mitochondria_to_produce_atp.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144514239/how_to_do_ppf_in_sbi.pdfIn PDF document text
    • http://lorugaz.pbworks.com/f/nursing_intervention_for_fatigue.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144518274/fizajusazujemapifa.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144704592/is_vanity_fair_outlet_open.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_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 5204 bytes
SHA-256: 94cc61ff74c0011cfbedc229ea51b10a1ddc8103e75459fa3019924f0001dc31
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 10260 bytes
SHA-256: c0c8382b3e93a352008f0d884079bf08d8910d2668e75627ac28c57e8397e164