Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bd8aca68781d6d…

MALICIOUS

PDF

107.4 KB Created: 2021-03-16 21:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d490759ca36db314c5cff93e43baeb SHA-1: 73be922413cdef010953374c52493967b379ac18 SHA-256: 43bd8aca68781d6d56ea19d298946439d8f713382b432ca8698c7ba6afee4a5c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to generate traffic to a large number of external PDF files, likely as part of a link farm or to host malicious content.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=trait%25C3%25A9+de+versailles+texte+int%25C3%25A9gral+pdf
    • https://nuxolabebaloxuf.weebly.com/uploads/1/3/5/3/135326303/batusuguzutetini.pdf
    • http://zofoxexizoviro.iblogger.org/38604748909.pdf
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/5a987be8.pdf
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/48d979f3.pdf
    • https://jazedase.weebly.com/uploads/1/3/3/9/133997310/jolujosigud_mugomulabodi_nabaxuja.pdf
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/fuvavekatevi_pixal_kajor.pdf
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/6402147.pdf
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/c1ae99.pdf
    • http://teligelufinuv.iblogger.org/beats_solo_pro_price.pdf
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/xarujuzikeximimaki.pdf
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/a6475eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/077f8b87-55ca-4b0f-8d89-20f1cf793eeb/33362977191.pdf
    • https://uploads.strikinglycdn.com/files/2cc1b9f9-3aae-439e-b193-54396b6d4b68/best_project_management_tools_examples.pdf
    • http://jewabavetedow.epizy.com/asma_adalah.pdf
    • http://likawunudonanep.epizy.com/pakuraminumobamo.pdf
    • https://uploads.strikinglycdn.com/files/054fb35e-da88-4c99-b828-2d1fb6071681/kajevimolujixegalamo.pdf
    • https://uploads.strikinglycdn.com/files/c584cac1-88a7-499e-b8eb-cc0e477d9bf3/52254907680.pdf
    • https://uploads.strikinglycdn.com/files/3098ecf3-7318-4b63-abd9-90acf2a027cb/kitanaxotizalujofiji.pdf
    • http://vipoxegoto.rf.gd/dobaresedirebezifomuge.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f6e.bin
a9a25ff6489bb3148d0239b9df0a9da61af376570f7892015ac5ff74fa728ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6E 5428 bytes
font_01_sfnt_off000171bb.bin
abe8fe8d88dde05d7c899d6685f19e01254ffe69e1bade652250214ac686c1d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171BB 14404 bytes

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