Malicious PDF — malware analysis report

Static analysis result for SHA-256 5534c5fa095ab0b3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 12:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a058068dad517157735fdfc8e22b4d0b SHA-1: 89019e36054605ce5bf81a50c637bdb5b50dc58f SHA-256: 5534c5fa095ab0b3a88613e46ce986dd4919601781fc85b17aedfa5e4e9da0d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to disposable hosting, and a heuristic firing for a 'download button' lure, suggesting the document's purpose is to trick users into downloading further malware. The presence of a link farm on disposable hosting further supports a malicious intent to distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=miui+12+for+redmi+9+global PDF link annotation
    • http://novena99.com/uploads/files/202109180043349569.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7b3a346b162152a9e1218c37ed075e7/fowoluluki.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/fekarakodadivutirakur.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/konupemikenanemivif.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/revezajora.pdfIn PDF document text
    • http://arablift.net/userfiles/file/pajifitegurotejufokiwani.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/60420705776.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/logowunejulewu.pdfIn PDF document text
    • https://izr.fr/files/tixisogepob.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/84185740724.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zivagozepedumim.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/kofemuzirufirusuloboj.pdfIn PDF document text
    • https://bloc-immo.com/images/51753883733.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/82907072323.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/8240078955.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/fuvuwesibep.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/49041484428.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/kopasefanuz.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/5615138402.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/64580530278.pdfIn PDF document text
    • http://runo34.ru/attachments/file/ruzuwon.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/jizipilimuropupata.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/26328555385.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jiwutinijeribolebawixe.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/92607710617.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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 10900 bytes
SHA-256: b60b5b4c628b6e49bcca5d9fdd34ca4e43bfdcb1529ded40dc53b3dd9679bc0b
font_02_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 17256 bytes
SHA-256: 625b0372f4357124af9f2fff22d03ab44a9088f3eebf1a8c0ca58080a03ab44f