Malicious PDF — malware analysis report

Static analysis result for SHA-256 44494e340914cc77…

MALICIOUS

PDF

80.0 KB Created: 2021-05-31 18:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5aca7854956777b8ab1fbb57cda8468a SHA-1: 8c675babf226d4d9c86c6d428adb5d60533cd63a SHA-256: 44494e340914cc77511668b5eeb5a11a6958e6fe1412f2d1f5cff7df86825ca5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be a lure related to a game campaign guide.

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://dafemum.ru/123?utm_term=attila+total+war+campaign+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379363/normal_600de879e165f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5fc9157ca99bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5fd1636377938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_602415412af8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_602a6e125a1a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481841/normal_606d4151841fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zemenifinabe.pbworks.com/w/file/fetch/144417762/what_kind_of_oil_does_a_ford_focus_2015_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00deb3f-5d9f-4f41-9a58-f63ae887db54/70516165565.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144417444/gagobepejepotezowiriwez.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413208/litesabosidasuguze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfaa7da-d099-4902-91f0-26085869143a/when_keyboard_doesnt_type.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415176/74396735719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c81cd30-85ab-4e31-b230-fa715d64be39/how_to_get_free_imvu_credits_without_downloading_anything.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/quantifiers_countable_and_uncountable_food_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6460c3da-a8fa-418a-a327-fbff899e7535/dawakadeketawepipotibezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017a75dd-4711-46a7-812a-21bd05b93484/what_act_score_is_needed_for_air_force_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72f2f5f-a9da-4039-8055-c97116eaf5b2/8348204120.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411618/45331797293.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/77876977449.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_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 5296 bytes
SHA-256: e67b937e57a966c788fcfa6f80b0712dde6f99dcaa4852e3096e31932b2e11d3
font_01_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 11128 bytes
SHA-256: 1c5f0588e5beb99781394cca0b9a2ff791cc1fd072259fb8af473fa991d9afa9

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