Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff8abdb5b2a2c88…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 12:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43f6be901e5370d5fb986e81ab7a812b SHA-1: 9a83c6bf9794f53d1240d0c37bd044f5345bef04 SHA-256: 5ff8abdb5b2a2c88ed493d9bcf2ac23de48cafb824387a5c7ca9d28f54bb98ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating an attempt to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=how+to+remove+deleted+items+from+android+phone PDF link annotation
    • https://shevian.com/images/file/tufefoduvosuwezimez.pdfIn PDF document text
    • http://belniig.by/public/file/salosizemupezusufaleti.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/gititova.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210903185104.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/43789381554.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/54701618444.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea82e156a---87493600158.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2d59b0f56a99ab9eabfcef9bb9bac35e/84879646028.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/38608286198.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/41953293763.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/31897407616.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/novevadabutoxelomobu.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/28423647524.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/32105017217.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/fitixejoxafirusorupi.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/soreseredaterot.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/33846947848.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/ranafefo.pdfIn PDF document text
    • http://apple888.vn/luutru/files/napodasaviwuzenuduxibonis.pdfIn PDF document text
    • http://104408017.linker.tw/files/37456055569.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/92640669146.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/likimebeninek.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/wakeruvu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/80813349203.pdfIn PDF document text
    • http://esistore.com/userfiles/file/bujus.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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 18120 bytes
SHA-256: 980d39acf14df28dbffc6412c430c094c0393f7eef39f9c85a60e746b9329a95
font_01_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 10904 bytes
SHA-256: e41147d70bd83ebe7fc0038bd9cc47a799d6cef31af07a5f5955f20f7f3d8085
font_02_sfnt_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.