Malicious PDF — malware analysis report

Static analysis result for SHA-256 9396d8122a372630…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 06:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f33ca5e26f67d6fb4dafd525f4fcf57c SHA-1: 16d0e977233fbb12be697cf16e2152912a50d18b SHA-256: 9396d8122a372630fcd7a0cd19758fd0fab84b2b3dccf3d282970841a87ace94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm designed to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

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 http://fundacjahfg.pl/upload/file/79806549052.pdf In PDF document text
    • http://iccjsc.com/images/uploads/files/69411140308.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/86574511412.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109100533302878.pdfIn PDF document text
    • http://chpcentre.com/files/file/55440700219.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/70430217155.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/daxewevaja.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/linisaf.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/rogaveloboruzovefi.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/81650860536.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/pekusolesok.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/69058513144.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d49517a2ce288c67bf4b0147aec71358/61203363718.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/mijosu.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/57208515996.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/11237234989.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/wodon.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/81261752983.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/41591521296.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/4465220637.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/gonufominarodejezevasu.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910060508.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6201bc89b0c8b57d1124a1596ec41294/koxabupumolejisa.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/60037823068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dragon+city+mod+apk+hack+downloadPDF link annotation
    • 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_off0000b0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BB 10952 bytes
SHA-256: 5f5a147fb2e7b34048f3a7de545736498dbc96dee26d3016b0e33d462f2b133c
font_01_sfnt_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 17464 bytes
SHA-256: 5853c0481ea15af3495b424b22d0049819adf6f0cb8747491607e11e948a3345
font_02_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1