Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e9784f84a46bdd…

MALICIOUS

PDF

80.9 KB Created: 2021-01-17 23:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e9b1624ac39128875e16d576f63b677a SHA-1: d062e45c3750035c16b4b7d50155daa4cf4c847d SHA-256: 25e9784f84a46bddb76970eadafbebf844ea116d8efdd1228c9b758d70107fec
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 links, many pointing to disposable domains, and one prominent URL that appears to be a search result lure for a popular book. The presence of external URIs and the link farm behavior suggest an attempt to redirect users to malicious content.

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://traffset.ru/123?utm_term=oprah+winfrey+what+i+know+for+sure+pdf+download PDF link annotation
    • https://cdn.sqhk.co/dawolesirip/Cogf3KO/dekagudujipolonar.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/sidjbig/geturagonelakine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5fc3589e5281e.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/PjaicOe/dragon_ball_absolute_warriors_2_rom.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/vazuliwuxapop-fudazanuxupuf-lugodevizufej-gevanuvos.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
    • http://vaxesopubowutuf.rf.gd/agrahara_gold_application_form_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/barnett_slingshot_full_shooting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/85598871108.pdfIn PDF document text
    • http://borovob.epizy.com/cardfight_vanguard_planet_wars_apk_english.pdfIn PDF document text
    • http://mamitepibo.epizy.com/dedarokulaxejalozu.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/gameboy_color_emulator_android_apk.pdfIn PDF document text
    • http://nimozan.epizy.com/nitenagegikisejelokixol.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_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 5296 bytes
SHA-256: 1fdaefc9369b6f623b8b18a519503706c0995ec9c47e7b16e2990926ff8ea2ce
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 10856 bytes
SHA-256: 08f30f721ac20648bb0cd034f70fc902ee13a478b95b8e03e99eef48b086407b
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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