Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f93e34dbeb607db…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 00:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb55a8b20da67ca34e68a7e7247676a6 SHA-1: 21b934edfeb11deea40e4943793ddaa7bbe961ed SHA-256: 6f93e34dbeb607db4d8366d2296a9d954aee8a03ebcd3977595339c4a92c85c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=multiplayer+online+android PDF link annotation
    • http://astorandblack.net/emailer/userfiles/file/raxunipisuga.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vpb2i6e0usd73p89q7du1spjg4/xofevi.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/maginini.pdfIn PDF document text
    • http://sns.hu/_user/file/57978420512.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/50093058245.pdfIn PDF document text
    • http://kgmda.com/upload/files/84567444445.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/68589988260.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/69827226574.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/37419272565.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/9399785479.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/98e0mf9gchq9gj596gcfna826j/sogipanakewegizazatex.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/welidilevatajidiv.pdfIn PDF document text
    • https://dptech.vn/uploads/files/77786324319.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/wezidimitewugaretil.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/84328039640.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/zigidel.pdfIn PDF document text
    • http://centronegozi.com/public/78725185285.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/jevexemebal.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/fefatix.pdfIn PDF document text
    • http://builderall.info/userfiles/file/pepawixovenakamifuwawizeb.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/65273360395.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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 10424 bytes
SHA-256: 2221853873cb6c075c2626f4c8dc7a68bed6e4b298c4564ec2e948eafcfa6291
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 16760 bytes
SHA-256: ec95f653a837759a27fae8cfdf5ba57c76663d5e42eaa26c7b8e2f44234ed84b

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