Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bf272a66dff609…

MALICIOUS

PDF

73.0 KB Created: 2021-03-20 20:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fe52a45fd490c75493bb6143393b85df SHA-1: 55a09ba29cc7a484ae4a4a5d9869fe3717d9d46a SHA-256: d6bf272a66dff609deb8ca8091b2dde70bd19f04b2af6b713966c528281f13f2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to medical information to entice users to click on these links. The presence of external URIs and the link farm heuristic indicate the primary goal is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=fast+facts+acute+myeloid+leukemia+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5ff0339321494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380531/normal_6007d667dc6e2.pdfIn PDF document text
    • http://pycnidwzxc.info/savaborizezobisawugelijasv540.pdfIn PDF document text
    • http://com-signto2.xyz/gederotamesy55fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_6054dc5e6e5b5.pdfIn PDF document text
    • http://wimobilo.iblogger.org/50665218580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legatuwaw.epizy.com/nakajalewewigakajilili.pdfIn PDF document text
    • http://nopetavu.rf.gd/lusuwumenelebenaw.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_7485e6410dd34811854999d7ff39b0d9.pdf?index=trueIn PDF document text
    • http://rovijog.rf.gd/1155143237.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_01e171c42aef4319a6bdbca2fa0d6a0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/lepare.pdfIn PDF document text
    • http://kukalofawofami.epizy.com/bivubivelefifafov.pdfIn PDF document text
    • http://kudogal.rf.gd/76073414675.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_1cf0c36acad946e29cdec27b2e31e520.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/sakubiwuvejidami.pdfIn PDF document text
    • http://lotapit.epizy.com/84352723603.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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 5328 bytes
SHA-256: a3e9c91359e1ab5f1ac8a486e2ef906d9c3a1e997c10a7f636c0aa6ddda43694
font_01_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 10008 bytes
SHA-256: 1145486f4057466fc0b40342472fa7f19cbc069b8fb78cadff745eef41f84445

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