Malicious PDF — malware analysis report

Static analysis result for SHA-256 19621a2d67b937e3…

MALICIOUS

PDF

74.0 KB Created: 2021-09-14 10:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec0e97867b6d5c20fedb0270304cf270 SHA-1: 306fdb461c5b6cc63b22a47826b9ee2ac43d85ee SHA-256: 19621a2d67b937e334efe3b8d0030bf7e79a7fae870c4a1f9c7d4cfc032b620f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://diamant-x.sk/UserFiles/file/37227099358.pdf
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lijofudekalagi.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/josncs7gs5cad4ciqg5rubcvqi/mugeveroxi.pdf
    • http://connectcontrol.net/files/userfiles/files/texox.pdf
    • http://stl-hk.net/userfiles/jezovolifuze.pdf
    • http://jun-travel.com/userfiles/file/84406771504.pdf
    • http://fernandopelosini.it/userfiles/files/lanunuwilalibalisor.pdf
    • http://superfasttv.com/uploads/files/pewajekamolilateji.pdf
    • http://motorlustor.net/userfiles/file/ropusawotukupukef.pdf
    • https://airin.lv/images/userfiles/file/lizase.pdf
    • http://pozitron-s.ru/userfiles/file/witebogun.pdf
    • https://rwd.webseo.tw/upload/files/fexuwujuremukavonaj.pdf
    • http://www.xzass.org/ckfinder/userfiles/files/dakisetarutaforusaxat.pdf
    • https://ochronaskory.pl/pliki_user/File/86249266484.pdf
    • http://goldmustang.com/files/files/pibezuda.pdf
    • https://paklya.su/design/img/upload/file/59332064842.pdf
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/19501004768.pdf
    • http://xutricolor.com/uploadfile/files/nanugegup.pdf
    • http://mathrainbow.com/userfiles/file/97916376634.pdf
    • http://medicamarsala.it/userfiles/files/keredetadowutulov.pdf
    • https://beautydent.hu/editor_up/47636951643.pdf
    • https://resicolor.com/upload/files/faresalikusixugarom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=7+maravillas+del+mundo+moderno+pdf
    • 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_off0000bc10.bin
35105acc822c3d4f5038f194cad1c78b2dfa5e9635efcfe6a352eaa08274ee86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC10 10680 bytes
font_01_sfnt_off0000d483.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 16792 bytes
font_02_sfnt_off0000ec95.bin
dec687ad09a75390f5992bc7ae0137815461b54c0aebfbf70a8b483894f5fdaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 17888 bytes

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