Malicious PDF — malware analysis report

Static analysis result for SHA-256 b806c7c8bf30b773…

MALICIOUS

PDF

82.3 KB Created: 2021-03-17 09:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b51729bd1ab2d836b618e83435227f SHA-1: a6e644a9acb586788118d96942a7c99d539a2a45 SHA-256: b806c7c8bf30b773d7418a3ac4a1c2115bb05d983ae96c88bc6b1ebc78e3beb3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a site that appears to be part of a link farm designed to attract traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=casio+calculator+watch+user+manual
    • https://cdn.sqhk.co/fudamozomeb/Ujh4Ljc/rojubukosik.pdf
    • http://foselosen.sportsontheweb.net/why_my_car_subwoofer_is_not_working.pdf
    • http://duwosolutanuz.mypressonline.com/sawepifimajuzevemifijo.pdf
    • http://vowujebotoza.mywebcommunity.org/sony_cdp-cx355_repair_manual.pdf
    • http://worabipupe.mypressonline.com/a_fire_upon_the_deep.pdf
    • https://cdn.sqhk.co/piredonina/jeiiheU/t_mobile_store_manager_job_description.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a65adae0-7611-4bdd-87ea-52a665364160/tempest_shakespeare_summary.pdf
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_e50c1b6895944a8b816a878f10e7e250.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf20b354-9ca0-46fc-8240-ab81fc12a4e4/6171247015.pdf
    • https://uploads.strikinglycdn.com/files/d4694929-af40-405a-acba-6ad027592daf/xisenoduvolas.pdf
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_f5afd3324dab444faa5bf78084670a31.pdf?index=true
    • http://supuwevul.atwebpages.com/vepepazukemig.pdf
    • https://uploads.strikinglycdn.com/files/5daa4c81-78ec-4c30-8fae-15d2c2c3648c/35188445473.pdf
    • https://uploads.strikinglycdn.com/files/25b42eb1-62fb-43a2-8243-9310eb0e4cbf/21705484304.pdf
    • https://uploads.strikinglycdn.com/files/4d2fa755-fa8e-453a-ac45-f2dfde096b6b/65550455313.pdf
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_5d8295920dc74de29f066c47ad0806e3.pdf?index=true
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_cea82382c4314e39a6e6f1917d0562a6.pdf?index=true
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_be8c935c1cca44fd8f507cd71155dba4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/10987641-15b2-465f-93d2-f760921d2097/lakipuxoromazumivasumexeb.pdf
    • https://uploads.strikinglycdn.com/files/4a7ae67f-f5b2-4ce0-aa34-618022780b6d/zilelak.pdf
    • https://uploads.strikinglycdn.com/files/549d5b9a-0e86-46af-bf92-7d4ad0961b15/is_there_a_sequel_to_the_lost_by_natasha_preston.pdf
    • https://uploads.strikinglycdn.com/files/8f94da08-3f23-4f6f-a9db-e40f5685c52b/34404537586.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001049c.bin
833271a02a11a7148404f37e100c1bba7ae0cea69c580a4a8df33b243a6d1fa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 5036 bytes
font_01_sfnt_off0001159a.bin
7c57d08d604b30553e7fac4375f37b200f79de783fbb33ff9a644d07e93166d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 11032 bytes

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