Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cc7c442baa3ece…

MALICIOUS

PDF

81.8 KB Created: 2021-10-09 14:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: bc7744ea57eefbc5fa095e5be697b118 SHA-1: 7eed6c8d1c66e4d0f6b7093ad0fe3d8af7d7d3ad SHA-256: e7cc7c442baa3ececcc5256a6cedc2b0d1205e45c7d873f55f899d92021dcf97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=undisplaced+radial+styloid+fracture PDF link annotation
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/70814707676.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145b2a0e7d74---17232147218.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qd4eb4cahgtlas1ea594e35u83/11276973183.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/5223360151.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/59878080074.pdfIn PDF document text
    • https://resepangka.org/contents/files/joledokewisuvulibona.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/didawelonenufokezipekir.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/1980003601.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/78448700264.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20211009193003.pdfIn PDF document text
    • http://ore-processing.ru/d/files/jimifaz.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/xadewidulotuwunuriwasaxaj.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tinagomoxakuza.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/30100390683.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/figig.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/20467074259.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/romometupafumopaxa.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/f151d5c43a2cac0414c89ef241736c57.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/24733675199.pdfIn PDF document text
    • https://indreninepal.org/userfiles/file/70409554540.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/66243553688.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/tajaturixosopibiwejowukof.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/93827419362.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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 17596 bytes
SHA-256: 1c13d77d3f36ad99134229ad5cdca7913856feb418e3e46117b0eb98896605f6
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10836 bytes
SHA-256: fa0aed52e58393728bd4e84cabbe2a5244e407db330b4136d0e28fc70c7d05b9
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1