Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acf5a8e63c86bbb…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 01:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: caa56cbf725323740f9e1ffae9e438b9 SHA-1: e4d3eb04d2cacde3837b35cfa605327731c0d8b1 SHA-256: 7acf5a8e63c86bbbedc6d20fabe46b3e618453c6ba598a2c2e576934ea318ed4
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=boruto+movie+online+sa+prevodom PDF link annotation
    • http://wangguanhardware.com/userfiles/file/monirop.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/mamewokupagofizupagonaxi.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/17214362548.pdfIn PDF document text
    • http://suurelepa.ee/data/file/danebuxuwita.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/6926305528.pdfIn PDF document text
    • http://gensugroup.com/upload/files/pudizutaz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/19193a22d9fcdae62e4b82e18c7518f0/vajazopizopafujegegetanix.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/143880316761406d243baa1.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/18075901442.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/97682791359.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/20494048859.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/vomunulukos.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/85220925146.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/92229896967.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/48532657137.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/tenevabamubelabivupi.pdfIn PDF document text
    • http://lex.tj/img/file/51855318571.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/wesufutisudukikip.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/2740677402.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/28293027683.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/voxevizugazexasizaruwib.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/fezonaxi.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 20736 bytes
SHA-256: 37e039da4d476d111c1878df069fb3726bb6113abf7ecbe7c83d1f27ee660542
font_01_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 10772 bytes
SHA-256: 3277ff780fba4e807cc9e9b6af4248c0cc37c395509678b63936e2af6a398cbf

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