Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c699ca13124aa7…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 23:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 675cf2d8f9d8770f4edf7d41d9ede576 SHA-1: 1f7aefca5cee5199ee17c1e148243248752ab422 SHA-256: d0c699ca13124aa76530d72f9976cb164c297619de6434aa9a1c63460b9eee89
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. The embedded URLs suggest a campaign to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cnwt.mgo.cool/upfile/files/2021/09/07/livofevezusutejebuxusewuv.pdf In PDF document text
    • http://razzledazzleevents.in/userfiles/file/gomabov.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/53779671943.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/21111975506.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/82581079479.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/genose.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/xusiwipukoduguxa.pdfIn PDF document text
    • http://consade.com/userfiles/file/vofilegusa.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/e3escle327pmg5tgvmgm0o3a8d/69881465266.pdfIn PDF document text
    • http://specimport.by/files/files/68905320537.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/86300859665.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/donusugofikux.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/14513595324.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/75842821934.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/57306014642.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/77022552912.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/24791323188.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/44009119671.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630963762.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/satabimokisowekux.pdfIn PDF document text
    • http://upakuika.com/img/file/rigazaparedoluf.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/ramowazizowujogil.pdfIn PDF document text
    • http://soles2walk.com/data/file/vovirixuwafepilu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/pudisigapivivuxodelelowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=8+iron+ball+positionPDF 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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 17792 bytes
SHA-256: ff6c6207292671d2857462e4179bb0743846d50c64f77965dec228c92059ae3c
font_02_sfnt_off00013917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 10364 bytes
SHA-256: dab88272f9f1629ed35176d45977fbd64a25e583d6c8795bd3b88b2990e60b1b

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