Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6401f9718d5dd6…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 23:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1561b819db46e44b59335b690f908632 SHA-1: 5c8402590305c76dd3478c06ec7601a9500d22c9 SHA-256: 0b6401f9718d5dd69c1ec393371d8384406b8df65d56703437d7fa65c4b0c1a7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=brewmaster+monk+guide+wowhead PDF link annotation
    • http://bofinaposo.iblogger.org/deadwood_the_movie_parental_guide.pdfIn PDF document text
    • http://rezonansmusic.com/gikonegeteku6bbqr.pdfIn PDF document text
    • http://souve.me/liwugeditavivigimutadelzfz5t.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/pamuju-gumezarerug-zupisozerurap.pdfIn PDF document text
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/zatiwudufap.pdfIn PDF document text
    • http://checkmycredit.info/4538645794608w2n.pdfIn PDF document text
    • http://istra-backwater.ru/480010075959rgq8.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/a4d1b6.pdfIn PDF document text
    • http://mutuseki.22web.org/42791922459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rebubokinore.epizy.com/vehicle_body_inspection_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/60191079288.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/1581355716.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/duvifakaxovesuxel.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/list_of_regular_and_irregular_verbs_worksheet.pdfIn PDF document text
    • http://satimizatojuge.rf.gd/pezot.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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 5412 bytes
SHA-256: 1f21002275265e6a4afaca0a28771ef837cc53ad794c8f287ecc64227d94e4f1
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10516 bytes
SHA-256: 3674036bf6bca6e72fba43dc6ad7f05ae830e32551c482f37360c6f9dfdb8633

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