Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a628969ef1ea6f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 06:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5986889bda4ca9a1bf25cacd2368261 SHA-1: fdea11e836c520b21720779457d84d0a47061990 SHA-256: 04a628969ef1ea6fe331eb5356586e5256446f03223045f7ed0b8f603bd61ffe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or link-farming attack pattern. The embedded JavaScript, while not directly executed in this static analysis, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=differentiate+between+prokaryote+and+eukaryote PDF link annotation
    • https://wfbulgaria.com/uploads/wysiwyg/files/42262974243.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/bodorufinavegam.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/ropedejibogibijanawuwuvak.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/6958343520.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/77715782101.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/20890584286.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/zifetedejewilukifikotora.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/43008600639.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/vefotarifuwuf.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/4vgmi9kllmtfsn4ur4bhgfrdiu/73854264058.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/panabufalurag.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/20555558562.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/29805321580.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/93105343207.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/rakovefukatuwanizivim.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/rasepilikero.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210913083845.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/noroga.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/bupibi.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/12736225735.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/69095540431.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/19713780274.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/72150977188.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/70354030692.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_off0000c1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FE 10812 bytes
SHA-256: 95bb5528e3a8e02057ac8a5e38ca59853c17ae4d4b969d889361007ba67f6036
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 16908 bytes
SHA-256: fb5b55796b28c7ffe74638a7add22bfa2449a6a22bf0c92630236a9bfb42b533
font_02_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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