Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06a900430550165…

MALICIOUS

PDF

68.8 KB Created: 2021-04-01 15:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0b0113e19da18f5d951530378a480b1f SHA-1: 1c05abc371095a812a0de60d7b02d5729f125add SHA-256: d06a90043055016518dc82e8235d901a1c2fe0ea9d47f7ba6ed8d88dbb203fc3
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. It contains numerous embedded URLs, with one pointing to a suspicious domain 'golowaki.ru' that is likely part of a lure. The document body, though heavily obfuscated, suggests a pretext related to a 'California bar certificate of good standing'. No scripts were extracted, but the overall structure and URL usage are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=california+bar+certificate+of+good+standing PDF link annotation
    • http://foxudenop.iblogger.org/62540897643.pdfIn PDF document text
    • http://pukatasenibi.iblogger.org/noxufovuvuguvavosapobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_5ffd1db31c3a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_5fe93ce4be480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_6051fa9004cf7.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/eO9hbhe/94360747969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_601368c1f0c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_60645866e863a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_603b7f49f2aa8.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/hjijehh/tanuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5fe30d47f15cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5fec94d7c778f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_60605da7e2a24.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/3eb175cf-645e-4bdc-96e2-38ece31132bc/verude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac1ae76-8380-40c7-9383-ac1c473b1fcb/modadusirubotibuwe.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_63152bf546fc41e5ae990ce0188e4e11.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_c5eae32ce98f4516b125080cc97e25dc.pdf?index=trueIn PDF document text
    • https://ba5d4ca7-777b-4ff7-855d-60fc8da7b8b2.filesusr.com/ugd/29a726_f2dfbade615247b99960b607278806a2.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_f171493a16d14e94ad347f3b9156de22.pdf?index=trueIn PDF document text
    • http://ralodanuf.rf.gd/appreciation_letter_to_employee_for_good_performance.pdfIn PDF document text
    • http://litafiwu.epizy.com/13779081651.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_8789d6269a5846888be9ef40a1cd3cd6.pdf?index=trueIn 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_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 5236 bytes
SHA-256: 7fb6ded0f0ef8dc8c37d1350b22b5629eabeb58f230c89e9f335b73b2cbae33d
font_01_sfnt_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 11104 bytes
SHA-256: eee8177c64aac1e8049cc1a1b50735f0650da8235220add889855969f3ad0bfe

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