Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ff81ad1692e897…

MALICIOUS

PDF

79.1 KB Created: 2021-01-13 20:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dc1aaa1fece7083ec453bc993e0613a1 SHA-1: 2933eb10978e6769feb8d75694f56fed0dc1c3bb SHA-256: 58ff81ad1692e8973914ea3227ff4fcedc04a23393d285a01ef683ce1ea07946
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The PDF's structure and embedded content suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

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://trafficel.ru/123?utm_term=amanda+fleetwood+houston PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fcd7d2c391b8.pdfIn PDF document text
    • https://vomagorawu.weebly.com/uploads/1/3/4/7/134720662/ligugomevaniximi.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/VvyntlT/76610700556.pdfIn PDF document text
    • https://site-1178729.mozfiles.com/files/1178729/kuximazetivusofuwolek.pdfIn PDF document text
    • https://mabalavorejeg.weebly.com/uploads/1/3/4/7/134769590/puxirefofobe.pdfIn PDF document text
    • https://dilomosef.weebly.com/uploads/1/3/4/3/134316650/1224c2cf9f0145b.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/Yf4tgfX/buzuwubaludulajalakev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fa6509db4081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kovozenamofox/9353743252.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/luponexusek.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/72259802487.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 4968 bytes
SHA-256: b063b3477bbab2d24d6cd9a22590cfb9cf439171add179aec46cf75a698f37e5
font_01_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10320 bytes
SHA-256: fc0a2cd79fa15ef344d38292b89f47437cdbd706d75ac948de6b839f57f861f6
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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