Malicious PDF — malware analysis report

Static analysis result for SHA-256 7145d9be2fdd27d7…

MALICIOUS

PDF

82.6 KB Created: 2021-10-08 02:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 16575dc1c152527b9b80575dc781a26e SHA-1: a2bc5da2650a83c9162ce01db8c0de34bcda810b SHA-256: 7145d9be2fdd27d7b535d78add71490afd41749a154c58f2ee92d9d06b573f20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://fruitssupplier.com/app/webroot/img/files/35028875940.pdf In PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/6644530135.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/96678552339.pdfIn PDF document text
    • https://shinaltd.ru/images/file/zasiwozu.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/dafojemigolo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/77286585943.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/maliwomojo.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/46112417548.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/mixuvawezej.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39346291462.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614954da8d8e7---4221180055.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/32187993588.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/12432868584.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/7667255577.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56606103785.pdfIn PDF document text
    • http://turnyras.lt/Files/file/kutobunusixabapizo.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/88037838224.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109211033401258.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/xexejakubisun.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/85727661585.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/jufasonixu.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/ropafokusaga.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/84231840699.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/senipasusepugetitisa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/10t5c207g221de5if41aoiof44/zegefafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mushroom+and+oyster+saucePDF 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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 19092 bytes
SHA-256: bb72120ccc4e07a0fd50de25c8f7e60097ced19cf900fdba77bee458a00a2853
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 10704 bytes
SHA-256: 116bd3b99baabbd06a9ec3e05b6d30a7e45d6503eba0f5ce08aac34c97f47f11