Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fa354b0e302a25…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 15:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 981908b2ba66288a430bd45304857391 SHA-1: ce80bbbcb2dbe5562a1a4ca29fb2fdee8ec5976d SHA-256: 99fa354b0e302a25da3200ed7629ae64d1065ab39d46f396b358607071a7d9a4
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and an action trigger. It contains numerous external URLs, including one pointing to 'allytemp.ru', suggesting it's part of a link farm designed to redirect users to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a high likelihood of it being used to deliver a secondary payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=tanki+online+crystal+hack+2020 PDF link annotation
    • https://onlinendttraining.net/files/fonukewilazetomosax.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/50203919727.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/fejudituxibikafukib.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/suzapefiregibise.pdfIn PDF document text
    • http://protok.pro/upload/files/85796714930.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b5f3745a9---doxositonozosojoridovedu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gagomigubilarewazebeko.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0d5c1018596cb3bc2cb50fb7c5ddaf77/tivotata.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210912144851.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/61895275801.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/jozevasanesometupiveti.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/R9E3bvXKApZ1.pdfIn PDF document text
    • http://actinq.nl/upload/file/nilojajabarem.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/18281394750.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/bakiriwu.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/50675220803.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/menuwibeguwi.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/12316850122.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/xafoz.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/7525584145.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/20531810721.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/kuros.pdfIn PDF document text
    • http://micruts.org/userfiles/file/makewazajubutilibukekexu.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/misozaleg.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_off0000ae58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE58 14048 bytes
SHA-256: 2d81c7059aa2672c509c028baa0143864cac47947aa793f2f7b6c4fdfd93bb8a
font_01_sfnt_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 10740 bytes
SHA-256: ff3133bc96b9cebb85226bb5ec6356a08388df6bfbe093d931b30c49c0b1561e
font_02_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1