Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b200a7257d48493…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 03:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cfe34da0096eec9e9ac9aaca44641016 SHA-1: c798432984eaf139910c5e7bbdc08d5fc7327f36 SHA-256: 8b200a7257d4849359d6a0480c462f48d5e5a83f44f03ff660b5018d2ae470c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to suspicious domains, many of which are structured as link farms designed to redirect users. The PDF's structure and the presence of external URIs suggest an attempt to trick users into visiting malicious sites for potential credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=steven+universe+the+movie+full+movie+download+free PDF link annotation
    • http://umffz21.ru/admin/ckfinder/userfiles/files/89622266851.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sarotew.pdfIn PDF document text
    • http://potya.com/felafekazokuw.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/43905625037.pdfIn PDF document text
    • https://eklyps.net/images/file/mexagedenefavomanejabuza.pdfIn PDF document text
    • https://equimat-cheval.fr/file/wanavat.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/jerowerunasufuxozogabis.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210909_D1E91A38DCB59DE6.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/rolarolesogegerexefepenub.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/voxuzalidab.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/vazudukulo.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/gelatuvipiburikenije.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/39403647356.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/78382891481.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/fotuvizoze.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/jegigikolebemaxigij.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/36786753749.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/21011880161.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/xovatufozodilipeb.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/24833549904.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/93894887566.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/17530108096.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/wakugenoxiketuriza.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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 10944 bytes
SHA-256: c2ffcab4a1f52a22757507c0ed42a2d0d1d1e98ad8c3f9a2edebdcfbe0b12920
font_02_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 14552 bytes
SHA-256: c36e1898f498debcfccbd72e5c785e2d2525c8162ccdf4a646588de2ef0661bc

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