Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76d08a531abe0b9…

MALICIOUS

PDF

97.5 KB Created: 2021-09-16 04:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f25308bea08dbb0ef758fd3bea85bda SHA-1: 7f3243ce0d1fd80bd36a46cd18c34ce8bf0dfc3f SHA-256: a76d08a531abe0b998e981ca3987e353fa6ee6b9f50dbd0630b98a3e813696da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to direct users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using many distinct hosts with few links per host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://www.alexgis.com/siteuploads/editorimg/file/75427848781.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/voratumusitobaxusox.pdf
    • http://yuanyoujie.vip/userfiles/file/munobunix.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/nusefati.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/19374476210.pdf
    • https://himalayanthailand.com/image/upload/File/31272598373.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/noromobojozite.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/19391710203.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d860b701---nefidupuviziwezotamekivaz.pdf
    • http://siripanyalamphun.com/user_img/files/443975244.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/11556900879.pdf
    • http://dkkarsin.pl/img/upload/files/tazik.pdf
    • https://matagujrischool.com/admin/imagetemp1/file/86359217717.pdf
    • http://www.niceresidence.net/image/upload/File/12645996312.pdf
    • http://ministryofrum.com/memlogos/file/mopad.pdf
    • http://lamelove-zakryti.cz/userfiles/file/nozimusafosogaruravime.pdf
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/siwefef.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/63047530612.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/67348617034.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/16892910176.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/wipopunomovutibodogov.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jilejupuzikakudesekodige.pdf
    • http://tuanlongland.com/upload/files/vifemi.pdf
    • http://www.puhito.hu/uploads/ropufeneromerinoxol.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/56107308961.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=yu+gi+oh+world+championship+2007+passwords
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119c4.bin
372bcae5d172c138812256db3f5daeeb5dfafdd7794b7ecbbd1b66dbe029f3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 11192 bytes
font_01_sfnt_off000133a3.bin
2fa5fdb761c9f5a20a46c300bf072e3006cddb6a2224f3c278ed529c39f58bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 17196 bytes
font_02_sfnt_off00016075.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16075 16792 bytes

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