Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b573026d1cee31…

MALICIOUS

PDF

88.5 KB Created: 2021-09-12 03:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52d863a1341304b58920995c1b79d64f SHA-1: 9c5a6cc9907c5205945eb0609741519255841895 SHA-256: b9b573026d1cee3131f12454801ab73c6897f906f7d9ca35e643fbed511de944
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware-hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a phishing or distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://assushop.com/userfiles/assushop.com/file/29507990897.pdf In PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/5720101195.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/miremidiva.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/74822563582.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/11944235223.pdfIn PDF document text
    • http://epplast.com/files/file/42300284320.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134809954148---55394460864.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/ruwivibalel.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/ronutumujipu.pdfIn PDF document text
    • https://agermag.ro/mm/file/sumategafefogixelupaxat.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/xidivezolosu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/37091260127.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/37388621203.pdfIn PDF document text
    • http://santeh.md/img/files/81333604103.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133884ae8dac---26619703994.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kozokefenununiseverewub.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/kemiwisavovowox.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/62722394931.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/divuxezovi.pdfIn PDF document text
    • http://haai.org/upload/file/27053481491.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/70910297328.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/figawotakibogozuzemenuka.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/32888222138.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/jejenaro.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/mebuluxafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rolling+stone+top+500+albums+list+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_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 16976 bytes
SHA-256: c45a06ad45932a1cf10889bd2f2f94fb246b575942f12477678ce77652904222
font_02_sfnt_off00013a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A59 11284 bytes
SHA-256: 79a8176d25c38adbd7b367849389cf79794270f53a2a0b232665220862d70f7b

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