Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c9a5a9403b3b94…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 18:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88b89e9b7be3beea48bc090c207ba910 SHA-1: cb54bf622e7ea418269c1d50a24470643f225b56 SHA-256: 45c9a5a9403b3b94e79b0833540a3de67473625f935b4612151e480b51e44b47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a high volume of links on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://queure.ru/uplcv?utm_term=death+becomes+her+online+watch PDF link annotation
    • http://didula.ru/img/file/30519162167.pdfIn PDF document text
    • https://windsbs.biz/files/file/11849474943.pdfIn PDF document text
    • http://gnox.vn/upload/files/novati.pdfIn PDF document text
    • http://computerdoki.hu/user/file/jexizevabogodakoloselo.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/gibareretotabarogozipefub.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/sididabazodi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zovetalabarorokas.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/69669535481.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/ninevojire.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ecfd0f2a---68746293861.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210907190702_1364361794.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/83916120184.pdfIn PDF document text
    • https://foodbiz.bdata.link/upload/files/degulusitaxebuf.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/13713537906.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/zekediro.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/99226491207.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/gumugifopukifoxevuz.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/8742939645.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09b533e7f---lukovetuzus.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/17935277764.pdfIn PDF document text
    • http://1carl.com/userfiles/file/7318592167.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/48975193537.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/sigexuriguvixumewuzikat.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/91533516192.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/lapoxew.pdfIn PDF document text
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/luxudotagazubap.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_off0000b125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 10720 bytes
SHA-256: c8883f27c96805d4fb5cfee71e6216c5fb7438ffd5d33a44b05c0a2ce009fc6c
font_02_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 15956 bytes
SHA-256: 9a9f74acff7c2d9ed8119ef982dd789d74a1c40059d8b8e388f970a8e361c7a7