Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7879a0a4f4fd694…

MALICIOUS

PDF

73.6 KB Created: 2021-10-07 03:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5414585e64a276c9ad4deb2194ba2030 SHA-1: 2f89ab6f44830788f54de9d1e2a2991973ed67c6 SHA-256: b7879a0a4f4fd694a56f264a7d6c344389abb1e3aabef43187a940d9d90aa0d4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for issues like billing or fraud. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=ccna+terms+and+definitions+pdf PDF link annotation
    • http://gemcom.org/userfiles/file/girukelagesasegupag.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/98026709835.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/zelekofogiguvani.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/25144728927.pdfIn PDF document text
    • http://air-ned.com/uploads/files/wedebo.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/14582434573.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/mijolunajabo.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210916132939.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/88384437125.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/vodunojaredexariwu.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/65101497025.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/3324684165.pdfIn PDF document text
    • https://bdata.vn/upload/files/30796920137.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/15903542824.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/wuxowegebepepixex.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/kilufu.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/45241144454.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/30718735638.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/14193861519.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/55457626690.pdfIn PDF document text
    • https://servicepapik.ro/files/10228691073.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/dogifufebevijelali.pdfIn PDF document text
    • http://pactolous.hu/upload/file/64129736204.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/nefugix.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_off0000bd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 10768 bytes
SHA-256: b8ca56a3f2d53965d96fe3da8428013eba936c60b4bc9665ace24776967c368f
font_02_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 16772 bytes
SHA-256: 9650f08d924238e6069ec4d24b20f6a8f7091371f5f83c23f311fe245cd53034

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