Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e60e0186dd0b6f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 03:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 83a8c79dc5353030a37abda503dab0c4 SHA-1: 8b0dbce85a2240357cdf9da35b3424449af01737 SHA-256: 85e60e0186dd0b6ff628e1b3f3f457779dfe31d74e14e12d72e754da8b2cec8b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF utilizes an image-only lure, a common tactic for phishing, to entice users to click on embedded links. Heuristics indicate it's a link farm on disposable hosting, suggesting a phishing campaign. ClamAV and ML classifiers confirm its malicious nature, likely serving as a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 69 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://exhibitproplus.net/mentorfinancial/page_images/file/96281941224.pdf In PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/mitosipitosuxa.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vofizejazukunop.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/68032156851.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/jozolabojipavep.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140663241650---zamumelonemefozidipage.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/52855914563.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/88888909797.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/taluvijuminemifimumu.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/2055613306.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/33274800804.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/xipepibivanam.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/menokekododofiz.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/bunokij.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/nelawimobupozimif.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/wojarebosalunud.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/42802142800.pdfIn PDF document text
    • http://0048.pl/48files/file/32810902270.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/tofolekubegusu.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/49149405770.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/bazekuxepaz.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/lolarenopanafotezun.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wanuxapinip.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/76802475062.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/gowilobobomuvovatijivut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+see+a+private+instagram+postPDF 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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 14028 bytes
SHA-256: 2e915e749cc6bacad4a34e4b3029d455c8ab4fbd666ab0a8b7abe9fbf3d6aed6
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 10692 bytes
SHA-256: 4d0a3d11be15e9942dc0c0297c5fd2a8bcde56a7cc14168dbf2ab32b3c40abb5