Malicious PDF — malware analysis report

Static analysis result for SHA-256 a404eaedf6a22d5d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 01:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ece55518f49bf3288fa829a170ecde64 SHA-1: 6e320c32f257f9c80a88b3aa3922165d11e27287 SHA-256: a404eaedf6a22d5d5e2ee407ea3e6273c45a64321fa2b91128fbe52d0fe8eb74
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to unknown domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates potential execution of commands, possibly via embedded scripts, although no specific script content was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bakineshr.az/ckfinder/userfiles/files/toputipobogek.pdf In PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210917054756_eml2ZWRhYnVqZQ==.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/xuwuj.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/bujewi.pdfIn PDF document text
    • http://01host.ru/userfiles/files/76877855450.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/tedumun.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/22081238723.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/61181192108.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/12361755293.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/59013507465.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wupenakanopoposisoruzata.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/84700198642.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/17883202276.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/sufefibi.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/widov.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/baxezasoxujow.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/89669886096.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84337259072.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/83911780153.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nunaber.pdfIn PDF document text
    • https://funbugs.ie/files/file/89998025997.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d7b150e6a---vevawu.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95649641494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+install+android+app+on+pc+windows+10PDF 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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10624 bytes
SHA-256: 02d34da852358458bcb49d8b5ed5d9d16aaaf4274f122f5c1e292e78dc7e281d
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 19288 bytes
SHA-256: 2d22753d644f8e2bbd2d82e4b652ab799d99fe6b5998f4ea47855dd7ca95b23b