Malicious PDF — malware analysis report

Static analysis result for SHA-256 31425756379b19aa…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 07:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba111132096654871cd4829c8d5dfc6e SHA-1: d555c8a0940a0efcf31ebb98fe394bd9343ef7a5 SHA-256: 31425756379b19aa2eea36cbcfb3763df0dbb8a904fcc91f256263d024482057
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms with UTM parameters, suggesting an attempt to lure users to potentially harmful content. The PDF's structure and the high number of distinct external links indicate a deliberate effort to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=lost+miner+mod+apk PDF link annotation
    • https://borsalino.ro/imagini_ws/80142425627.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/retowuvujekikukaxaleb.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/99235931209.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/30816142239.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/mixakozumuweguwotub.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wemiwusokezojibexego.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/ropikezad.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/38804867782.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/rivira.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/48481501424.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/porubuxodubugiji.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zakapimijuribadoso.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410d95a2f96---solozuvaroxefigitazezebag.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/56503078230.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a156c958---33483956185.pdfIn PDF document text
    • https://jss-moms.si/upload/File/totodugovijaxezodenis.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/95468466694.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pevenodusefakidoti.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/23174345117.pdfIn PDF document text
    • http://spbi.cz/res/file/mulumolusigotoxugiwe.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/gudanefifexosivoletuzu.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/fonomapojipege.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/59161902887.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/99609535242.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_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 18280 bytes
SHA-256: 5333865afdc83c694136f921a8161dbd779148109ab6e89b7a44cd6b809ef535
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 10556 bytes
SHA-256: d93788fc00883bbc26f34599e8674c00425aeafb986c3611849342c73465d89b
font_02_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1