Malicious PDF — malware analysis report

Static analysis result for SHA-256 3780f19fac16dac2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 18:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa68e55290ddfd95e6b951645b138a55 SHA-1: 1ea8a3fe34fa953d7e08b27d39cb1d4faa3cdb83 SHA-256: 3780f19fac16dac28d16b85a2b1875323c198cb2106904976580894fadc98252
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm on disposable hosting, likely to distribute malware or phish for credentials. No scripts were extracted, but the structure and heuristics strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=android+games+new+releases PDF link annotation
    • https://themalc.org/files/file/xorapejejulugagadoda.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137dbea4ed5d---60190748844.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/9536400384.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/46018830745.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091209313570.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/78177866464.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/repepakupebidikogazorusa.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/88865481876.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rirefu.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/19195510089.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/85285677809.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/97524344203.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/43153959303.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/48243301030.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210916231027.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bepotokavevajowowozu.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/4652078075.pdfIn PDF document text
    • http://runhouchem.com/upload/files/16798704107.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/kenivugazaxexurelufa.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jowomalapon.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/lazuruxipip.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/20065277814.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/wasakaku.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_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 17784 bytes
SHA-256: abead1caac687b5ca7a39bde82d9c66bd2b99b63076c2463822c5053e7de8bff
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 10560 bytes
SHA-256: fa72a80b2a9c770c5f1b3d4d3c94e6edf78661b2eedf54a9a30ba3350f46c09f

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