Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bbe4565eb03ea9…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 13:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 44af60de91112c860b2ddac45519dd12 SHA-1: 8edce959efe8c659d7479f4acc159a87b1ff16fe SHA-256: 02bbe4565eb03ea998453c7cbaf425cd5abf7fa06afbc99c9a4ccf5d53143840
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest a phishing or malware distribution scheme, where the document acts as a lure to external malicious sites. No scripts were extracted, but the PDF structure itself is used to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80aa5alfu.kz/file/79847030213.pdf In PDF document text
    • http://sujitonweb.com/userfiles/files/galubot.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/rebesosesifunedekow.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/tewezokutotagopubufone.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/satujaxi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/51493460335.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/poloratodasep.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210919225852.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nodibisutiwedazeno.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/litalalezona.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/wujuximebevutotap.pdfIn PDF document text
    • http://mariancozma.com/_user/file/karutepifinizile.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/79798138099.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/90507003449.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614433ffe3088---nonibetafananuzilibadas.pdfIn PDF document text
    • https://chp-travel.ir/data/file/76748609448.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/88757695002.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/xavudukewijinoderagonazus.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/76928997194.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/durumusosigutu.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/69973789434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=frindle+read+onlinePDF 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_off0000ac7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 9952 bytes
SHA-256: d9e1a65a7529df541e15135b0b4860b2797ea4af6936368af94d38d450cdd682
font_02_sfnt_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 16716 bytes
SHA-256: 04051a22c96ec206676135c079a108379fd40d20d80c49a130f56c361f958c17

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