Malicious PDF — malware analysis report

Static analysis result for SHA-256 374de84728942223…

MALICIOUS

PDF

75.6 KB Created: 2021-09-23 04:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a50e28afa2b53ba7e5eb2c2adb432d0 SHA-1: 68c50f66bf40bbbe64e7c82ac6c1643eb34a7dfb SHA-256: 374de84728942223b9ecf71975b5bcd35709632291be9e93e4e31c8b4b924636
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://bnovum.hu/downloads/sapuruwupe.pdf In PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/21818041129.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/kegepunibudet.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/giwepobojo.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/43371406749.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///2947552593.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/94589732827.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zapesi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149db63a7818---27055990965.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/73754874592.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109221624562962.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/jakenul.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/podabixexazosa.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109210116257773.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/85646295721.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210910_113033.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/kesarogugemozado.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gapapuzebalevukisuxedekat.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/29901696609.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/83692311054.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/lugetevagideresiz.pdfIn PDF document text
    • http://halmar.info/userfiles/file/96136632535.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/xenodif.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/89672678245.pdfIn PDF document text
    • https://mikludava.lt/images/files/68664448064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=boss+2+bangla+filmPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c827.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC827 16864 bytes
SHA-256: bbbb1551878ceb84551072526d80353d9125fa5b69b6506d7fb91907040d8bdc
font_00_sfnt_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 10540 bytes
SHA-256: aacf51769d2b69add48e08b745bdb709b4a7f228f203be691b79ab0b68eca4a5
font_03_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 15752 bytes
SHA-256: 5db317025b1fd7d9df196c624bd15886846dc0bc991f7126dbe4255d7bbb7d1b