Malicious PDF — malware analysis report

Static analysis result for SHA-256 9183de5dfaa5e1f7…

MALICIOUS

PDF

67.7 KB Created: 2021-10-17 10:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e065fec4ac8b426d0c7e3a7633275cd7 SHA-1: 5934350647369277a0badb287c9a2259395207ae SHA-256: 9183de5dfaa5e1f7327bec79fd529adbb9b74210e28a69bc3ae0dbf9b2c0399f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing trojan by ClamAV and ML classifiers. Heuristics indicate it's an image-only document designed as a lure, containing numerous links to potentially malicious PDF files hosted on disposable domains. The document body is heavily obfuscated, preventing a detailed analysis of its specific intent beyond a general phishing or download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 67 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 http://viajaconsciente.com/imagenes/userfiles/file/33151967144.pdf In PDF document text
    • http://xy-interior.com/uploads/files/202109090632198532.pdfIn PDF document text
    • http://rococosofa.com/files/files/godiwedigub.pdfIn PDF document text
    • http://xn--80aaab5bgii0ck.xn--p1ai/ckfinder/userfiles/files/45649383180.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/211006144750008662a9udd.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/28699715648.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/90356818285.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/35186224007.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/2629974462.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/74732124923.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/35967386386.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/61153276943.pdfIn PDF document text
    • https://olterus.org/contents/files/83702136037.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c8af42f0e---zataxaxumere.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16151f5b35d62e---karimudiputoxovutatomipa.pdfIn PDF document text
    • http://erictex.com/ufiles/files/14322438924.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/bopek.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/pekumezaw.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/78603108536.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219221616272787.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/laxef.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/66089071072.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20211009110727.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=remove+text+from+a+pdfPDF 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_off0000ae96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 10464 bytes
SHA-256: d31383ddb184825855460f4f070bab4c3e90979aa2901442ffc8deb7e2c4a1b8
font_02_sfnt_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 14152 bytes
SHA-256: 077036c1c0dc894aacfc5a1963359ba109b1cf24f3a4bfde35e7ca8714909395