Malicious PDF — malware analysis report

Static analysis result for SHA-256 d976a7d6327a5883…

MALICIOUS

PDF

68.9 KB Created: 2021-10-05 20:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0645d5c2123cca8f42301a37be780381 SHA-1: fe40d5a840dd329f4d38f18e18ad85afc783c085 SHA-256: d976a7d6327a58839708920561dfcd1d1f94094a66ae43f2bc602dd7cfa16db9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-based lure, typical for phishing attacks, and is flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, including one at `https://chcial.ru/uplcv?utm_term=pt100+formula+for+temperature+from+resistance`, which likely serves as the primary redirection point. The document's structure and the presence of multiple disposable links suggest an attempt to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=pt100+formula+for+temperature+from+resistance PDF link annotation
    • http://mediaworld.pro/ckfinder/userfiles/files/67708741303.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/finiwavunu.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/31504582925.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/vufevepuwosofubufoginus.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/59741855327.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/54275727997.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468dfc04f00---davidirosuxafewaful.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/futuwefobalijiwoxadux.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/77900039219.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/68783139886.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/96288551831.pdfIn PDF document text
    • http://xhzhengli.com/upload/32178463692.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/retewofisozig.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/kexorelamijavarovadape.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/wujen.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/rotejobonowobuwejedur.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/22852638857.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/29099484462.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/81136464733.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lafosiwubokededejiwefi.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/10937563192.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/6519799182.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/widuzexapovofevan.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/memibinolodenidese.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/fapimagajamizagig.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615b305b66ee5---82598154562.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_off0000b128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB128 14120 bytes
SHA-256: 2e65061c981e2d5ff29604881b9b3a75bf40efc3e1745b903d6f14ae45e41452
font_01_sfnt_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 10916 bytes
SHA-256: 99c923638e7338bd290a9dae6b94f31d94177d92400f1e5b9c0b4d698a33357c