Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c5c0bd0f8d247b…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 23:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 317f226a4cdc8dddb0af9f69affcacd7 SHA-1: 754bb44bb7fd8683406d7c99ba9577ae686b80a3 SHA-256: 68c5c0bd0f8d247b39e90ca74c3c204a5d476a6fcd42887d46621acec66b7f5d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links, some of which point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ms1oke.com/contents/files/gederaderiviwogawev.pdf In PDF document text
    • http://aaz.sk/editor_uploads/files/nexakelof.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304268d9a6f---wujewimolukujubi.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210911_5D21D21F0B8CAE54.pdfIn PDF document text
    • https://digireg.cn/upload/10027838620.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/2900308462.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/mumoluwopanobaze.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/30467762503.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/betot.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/22560581202.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630730766.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/ninel.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef8bb4a395---39271925451.pdfIn PDF document text
    • https://naves.cz/res/file/76402129459.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/tigadetevam.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/fedolidezegagu.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/vobitulafavuvun.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/94381632059.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/72925872820.pdfIn PDF document text
    • https://33mobility.net/uploads/files/xenotoderedekexifiguxev.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wulabelibibatuwe.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/51294377916.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/tikafirutawibasux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=find+instantaneous+rate+of+change+calculatorPDF 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_off0000b001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 13916 bytes
SHA-256: 318f78800d679e92e8d411dd13bfdbbf30e05ea2748281a931336c6d03f67c03
font_01_sfnt_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 10832 bytes
SHA-256: a1a79ddd123e06671355a10ab0dd95f1eb71a8df1b929be78cedcc7f6d36cf83
font_02_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1