Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7c5468ae523950…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 11:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22dfde3bd1c8fc589d04169e742f993a SHA-1: 42f796ec0abc20af32e63efe697a1aa8f4e4a873 SHA-256: ab7c5468ae52395032c7acc7ba492e02019fa67bb4fd50f3ddf198a84a66a740
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the ultimate malicious destination. The presence of external URIs and the link farm heuristic indicate a strong likelihood of redirecting users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=mx+share+download+apk PDF link annotation
    • https://un7un9b3rl1pa7-99.com/contents/files/26224348637.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/sutasesasuv.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/2039424103.pdfIn PDF document text
    • http://ceroki.com/image/files/63491468004.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/bipuzoterutojomes.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/sidafujobapugavofafubor.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/82470379743.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/52056342368.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f561a913f5757dfbd940ac225ba6b934/dedigodedidekosu.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/47499596595.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/os3okhjhp7mmibjccb5h66n5rr/kokuwusazosozudoxud.pdfIn PDF document text
    • https://kimcert.org/E/file/44947117119.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/57209991881.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/jelibibirixinelumete.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/73625560537.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/29052672537.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/79682051256.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913170547430520.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/68773090299.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/mesufafemolusetemixi.pdfIn PDF document text
    • http://cbstav.cz/file/98641297202.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/9374567292.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/1885280913.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_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 19160 bytes
SHA-256: 075541fb44965dc2004df0698ca02d484bdc58b46eeb07ca6176f18a4ad35c9e
font_01_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 10572 bytes
SHA-256: b33940ab3732a87eb2ccb1e77dadc993ed790b53653eac2ff931dea49b72da18
font_02_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1