Malicious PDF — malware analysis report

Static analysis result for SHA-256 215e497ef929e104…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 09:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d81a744695c03487f48263d54c1306bc SHA-1: b7eb29bdcd98bc305d8b88e322064e590417535a SHA-256: 215e497ef929e104644af81702200627f263603ca09f3802011e2672452280f5
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, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish for credentials. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bbmeti.it/userfiles/files/27027853524.pdf In PDF document text
    • http://holzbau-napetschnig.at/25274737208.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210916112913.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/lonafikesarizazewavajose.pdfIn PDF document text
    • http://tayles.com/uploaded/vegakoxodowurenizof.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/35491097506.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/31602161923.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/limiginokiraxup.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/wutesi.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/nevapedogabili.pdfIn PDF document text
    • https://skostishoes.com/userfiles/file/34621351759.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/69557806301.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/45038821057.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/99342408828.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/kawut.pdfIn PDF document text
    • https://efnnma.org/files/file/16424187965.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/fiviwuwizixilewileko.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/tanotoguv.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/tuzaxiturew.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/dovikakawe.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/kalujixepedajawajapapun.pdfIn PDF document text
    • http://888chji.com/userfiles/files/95045750542.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/63079732258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=meilleur+jeux+tablette+androidPDF 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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 10540 bytes
SHA-256: e18477bf7ea00407281315881cd3274d219dd0ada8d8af12ade20850cc580d3b
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 19360 bytes
SHA-256: 8368485f83f6a977959d3e124090cca57776f745f1b8a41ca3ff843cf4c2ca01
font_02_sfnt_off00012dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1