Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ea962b136fa0b2…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 22:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e8081f8c9300de653518e36b6890d11 SHA-1: 8ccc5bf978a755f05d1b44b43934067e5aa9d92e SHA-256: b4ea962b136fa0b24de77a813d22c1ce9fad01b95404e56de225c0451c429f96
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of other PDF files, likely for malicious distribution or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://tongchangkj.com/uploadfile/file///2021090404501369.pdf In PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/24824021228.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ginagene.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109041634146057.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/83573963656.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/54602989538.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/pojapafifeduxelebixis.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/92443803243.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/jikiganepamivoguvimot.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/pikavipafofereweji.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/66297536796.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/gidodotumebaxuruwuzu.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zinisotugala.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/zasox.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/dajelafurogiguzerelu.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/37702100882.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3679aef4ad8e404b5580f116d401b4d8/52734891155.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/tedademek.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/sepifopetiwedefuludonog.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/l2ei5ih0hh2btpemc8mkfds01r/fokobixab.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/49905024639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+save+just+one+page+of+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_off0000bc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 17696 bytes
SHA-256: d9ef6dc50a14de082a8ae5e2085491b1ebb3cd6e1b8c944ea747a79a7c348dbf
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10924 bytes
SHA-256: 6eddda3814cfc8945c1602a371272cd0821b0abcff9f3608bc7c840f6f63c34c

Open this report in the interactive analyzer, or submit your own file for analysis.