Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f885d7ba8de5ceb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 14:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: efc875199466ba6a8605142d935bf5d7 SHA-1: 76878cebd3d78eab9cfadcc5e2b44cd911facc9f SHA-256: 7f885d7ba8de5cebba113f838473afdf2647138044b4b5240ba62262f46d6511
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lead users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=talking+tom+free+games PDF link annotation
    • http://gandolfiarchitetti.com/userfiles/files/740483769.pdfIn PDF document text
    • http://medi-sen.com/files/files/87878868792.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/kakagozejetigegojej.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/30285544372.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/91581493622.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/kuboserebijaluzipezatuzu.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/70975265617.pdfIn PDF document text
    • http://twilaw.com/files/files/3803555126.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/sudolor.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/48458529289.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/jowesivovebejilijuj.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/xusitotatafafilabuju.pdfIn PDF document text
    • http://ametansk.ru/uploads2/29415237243.pdfIn PDF document text
    • https://combrooncom.com/contents/files/jidezimoladusinipufafa.pdfIn PDF document text
    • https://greenways.at/userfiles/file/faxofugorizezifurasez.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tixatanumezabuvibada.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140572e6d255---rikijogalev.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/lewonexalozunesag.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/gegofejuwafaxovola.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/74410069053.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/91916580698.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/jitudanejivivoxarezusup.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/92374624647.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/50233582210.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_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 10612 bytes
SHA-256: e3776cee76485c631456bee61655b166bfe905b819a9bb34fabbf274c1042139
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 19040 bytes
SHA-256: 174338b4ac1a21cfe305a117cabcf61bede44fe3d5dc03d8380e9f6776ef658f
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1