Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae3a2c80dff3217…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 18:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3694fe2ad356afd7433ce428bd943f6a SHA-1: 1b0dcc76d4894ecd92dfce00c6287df90f63d1cd SHA-256: 5ae3a2c80dff32179ef6c9c6d669a47f42867a5fcd129b9ea8d31980d818f92a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=dead+trigger+mod+apk+free+download PDF link annotation
    • https://luatsuavina.com/userfiles/file/lusob.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612ff7050714c.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/15602898168.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202192325392028.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/jimiv.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/58134171781.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/xufafubesufuxemutisudaku.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/govajefe.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/98744710019.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/26996630640.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/bifosima.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/mujopifabasujojotosifova.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-9/20210909112657900185.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/kevetowulupituximet.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/96569477749.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/zirikekalowosikokekukaxir.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/51873282760.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/48921212944.pdfIn PDF document text
    • http://plise.org/userfiles/file/galisunulogezije.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/zimitofajijazifu.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/padukupekuw.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/rexosizokanafomamisakana.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 10852 bytes
SHA-256: bf299d708f0945cae76400a8d6e2a8011c65094cdc649c80a06a48b3612f8388
font_02_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 16712 bytes
SHA-256: 0122f2b7e237fa1eb6d99c1bcec8e1824833c90f245943e2974630f4a518ca37

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