Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b079a6ddc36495…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 01:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edb72ed15ba6ba0ea796f55ce9b3f62e SHA-1: 6779c377ee30155662092bafb22fc9684f240e74 SHA-256: 74b079a6ddc36495843e06d839b5d3349f2cc302a4225651ab05f499977b7767
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI redirects further supports this, as these are commonly used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=top+gear+worst+car+in+the+world+stream PDF link annotation
    • https://groupunsur4.com/contents/files/garivumud.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/pijanizosof.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/68982960994.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xidewi.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/dipabesibutilotivuvarul.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/mevubaxagosunediveb.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/62743610443.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e1e94e0---bofexurupa.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/wifiz.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/rabatalodanefa.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210919113439.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091210312073499.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/9930050126.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/rigutexopotibilude.pdfIn PDF document text
    • http://tochuchoinghi.org/files/89023849345.pdfIn PDF document text
    • https://halkum.rs/files/87391407279.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/pelabajonezexuwejutuzu.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/26845588408.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/49633839086.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/vipusibotexugizegogawis.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/rejuraxosekepilufujureji.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_off0000ce9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 11008 bytes
SHA-256: d9ca1252d280cd8c62c345a93c476ece9db0cdfb7178733977813e0428ca1a5a
font_02_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 17708 bytes
SHA-256: 62aa28ac9232c5f36bfdc4c3c04bdfa503e606d9adc088bc58003476d32ec798

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