Malicious PDF — malware analysis report

Static analysis result for SHA-256 327b0dde9c580d8a…

MALICIOUS

PDF

83.1 KB Created: 2021-05-30 01:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f239d5d886b3ba9f9ade7a4d897f50 SHA-1: 40e5444cb5a69e14ee4eeaae5718b30564052f86 SHA-256: 327b0dde9c580d8a835e8bb3c651dade1570190fdc1e71ba3cc2a7ae9d0e38ca
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or phishing attempt designed to redirect users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to leverage external resources for malicious purposes.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=wordly+wise+3000+book+10+lesson+1+answer+key+pdf
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/2173832.pdf
    • https://tofitumo.weebly.com/uploads/1/3/4/7/134767961/gariguposirirozit.pdf
    • https://static.s123-cdn-static.com/uploads/4447885/normal_600677a859a2c.pdf
    • https://cdn-cms.f-static.net/uploads/4382780/normal_606d6b38423aa.pdf
    • https://sozuxeboniwuk.weebly.com/uploads/1/3/1/3/131381135/sekopetakelikanutoz.pdf
    • https://cdn-cms.f-static.net/uploads/4460708/normal_6011235721a15.pdf
    • https://cdn-cms.f-static.net/uploads/4456660/normal_6013f4b57c960.pdf
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/vutave_wokenode_nazaforos_nopakabu.pdf
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/9680381.pdf
    • https://cdn-cms.f-static.net/uploads/4375194/normal_606e5c7f488c4.pdf
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/bomulinawuvamagoguza.pdf
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5ff0c157a8257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/857dd2c3-796f-4ff5-b4d4-aa270c1c8c26/which_tankless_water_heater_is_best_gas_or_electric.pdf
    • https://uploads.strikinglycdn.com/files/cd515cfa-a5eb-44c2-8fef-8e389990a102/the_misfit_of_demon_king_academy_wiki_avos.pdf
    • https://uploads.strikinglycdn.com/files/c261d8b4-2358-4492-8786-c9a38efff5d7/lejobezejavupep.pdf
    • https://uploads.strikinglycdn.com/files/aebe4770-5bcd-4963-b5fc-e8c32d60782c/noteki.pdf
    • https://uploads.strikinglycdn.com/files/d34386ac-3aab-4187-a8ad-00674a13c134/watchmen_graphic_novel_storyline.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7db.bin
2c5a153481b5f2dbd7f6c92a16d3c148dfb7ce737ea9efdb7a4e24751b78eeb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 5804 bytes
font_01_sfnt_off0000fbc7.bin
f96c34ce3bbd32113ec7f1dd0a58663b79e0dd7ab7e7fc0be970bdc0a6ebea86
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 13592 bytes
font_02_sfnt_off00012779.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 16204 bytes