Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cf4972b8581463…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 17:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d28f7a0ee927681cd52f6d64b490ed23 SHA-1: c9047837ba42a0171ec09efa93d7ac93aae5170e SHA-256: a7cf4972b858146367bd4387b4bb2b92e6bd4f8eb49faf6dafe9d37b2aef44f9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=change+notification+vibration+android PDF link annotation
    • https://alkalacarservice.com/public_html/userfiles/file/61241709391.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/6275967256.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/nefafatifori.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/27658392013.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/karawetawixafanojivas.pdfIn PDF document text
    • http://mosjob.ru/images/file/20840443428.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/kanumozubejunevemusuvi.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/xizoxabovivaz.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/27522343390.pdfIn PDF document text
    • http://packamate.com/userfiles/kefusudati.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/nezipupe.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/guruminedes.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/2904372863.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/bugupekov.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/xejeke.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/10744327511.pdfIn PDF document text
    • https://masihpt1.com/contents/files/mozaxi.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/torisexoxogojowewoniji.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/pelutelever.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc023386c---5519751880.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/doseriwova.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7e1db6b4---miwezaneturutidazuz.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/wiwozag.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/2338749535.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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 17448 bytes
SHA-256: 03a9b683ff545897719709d686f3665e1944ec5883b1c13faac9ceeb1eec19d9
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 10776 bytes
SHA-256: 678038b679dd16d3819a4b8595bb34e9b562d2f2175634bdb89e4a0ffa6717a9
font_02_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1