Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe53e170b969162…

MALICIOUS

PDF

78.0 KB Created: 2021-03-09 15:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7b5bcbfda319ffa85d83f6e0e2f32056 SHA-1: a0ea16e94077b4cbe8c350aed097d742a7cdfd08 SHA-256: bfe53e170b9691623e592bfacd26c36a98634ea1e40591dbaf61a6e32ca1058c
126 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 hosted on disposable domains or link farms, indicating a likely attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were directly extracted, the structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://kuzutuzo.ru/strik?utm_term=3+billy+goats+gruff+activities+early+years PDF link annotation
    • https://cdn.sqhk.co/binilafobet/hfhhgfp/mixukirimimemepotewo.pdfIn PDF document text
    • https://rutesobob.weebly.com/uploads/1/3/1/8/131856950/6486199.pdfIn PDF document text
    • https://zimekepipo.weebly.com/uploads/1/3/5/3/135351260/a21bc.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/relosa.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/5960088.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/definiciones_de_artes_mayores.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/f39da5c8971d2.pdfIn PDF document text
    • https://cdn.sqhk.co/mugodetutag/c6hcjgX/asus_music_player_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/hi8gfo4/bijodavasekuf.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/7pggihu/36285622903.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/5125196.pdfIn PDF document text
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/f24140a3eab.pdfIn PDF document text
    • https://vazanekufom.weebly.com/uploads/1/3/5/3/135322674/kobirula_wuregotafukuw_wotanakudadu_mivijane.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/ef532706-ca97-4ba7-ba54-fb3f930723d4/nezukapudarizojifasezut.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/what_does_the_end_of_the_handmaids_tale_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da256be6-ffb3-444b-8e05-29dcad723bfd/24287049870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113fbdcb-6c5f-4854-bdc6-b54df5d53024/how_to_know_if_something_is_a_strong_or_weak_acid_base.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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 5420 bytes
SHA-256: aec0ece116150bcac19b7f650ec59b7ca0f3a3515f11e9f1a1f24d6e5f17c904
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 10608 bytes
SHA-256: 9c35368f8abd1e17465184da43bc6edd70205ea9658d03ef480012413cd72148

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