Malicious PDF — malware analysis report

Static analysis result for SHA-256 071f5339848ca7b8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 19:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7d8fee339130a2b4749681d14c43cfd SHA-1: d5a2576b21190456aa2188bafac05f98fc410888 SHA-256: 071f5339848ca7b8a207afc28da8c9ac83bb93890ff11115e084cba5f1b1824e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, with the primary suspicious URL being http://otelm4b.ru/admin/ckfinder/userfiles/files/sivapi.pdf. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://otelm4b.ru/admin/ckfinder/userfiles/files/sivapi.pdf In PDF document text
    • http://hyunsin.net/userfiles/file/porelizasud.pdfIn PDF document text
    • https://aksusu.com/upload/files/xozaleraj.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/24107677899.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/41016313492.pdfIn PDF document text
    • http://video-cycling.de/files/file/pazewo.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/namokomajiniluxezazupe.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/35120754537.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/45903084514.pdfIn PDF document text
    • http://weingut-suppan.at/files/26132760812.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/dirumudutarokarokil.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/tajojesowa.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/46771060909.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/pokebasedon.pdfIn PDF document text
    • http://cke.hk/userfiles/kamome.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/2692527624.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/52726980175.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/16081414981.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/guderazinimawi.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/74184433391.pdfIn PDF document text
    • http://tcihk.com/userfiles/1519620519.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/41364073815.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/dewamovoluzasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stream+ios+to+firestickPDF link annotation
    • 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_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 19032 bytes
SHA-256: 370b0b80c0a3b1156125b82c6cba58308c041ac69a010f84b1af7cb1f29aa4fc
font_01_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10516 bytes
SHA-256: fddd50e528b083b5181c1e951e86c03748ed5fb795bebdd5941667decd2d92bc

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