Malicious PDF — malware analysis report

Static analysis result for SHA-256 549403a810c33454…

MALICIOUS

PDF

73.9 KB Created: 2021-09-10 10:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f33362f25f190efa383eb25d980b5e4f SHA-1: cd0e176cb1746db5a95ec8b1148f4d9b7269b3c7 SHA-256: 549403a810c33454fc62069196ec344ef22e10b11baf00b4d93b259078f6add2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 external domains, many of which are unknown or potentially malicious. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to exploit vulnerabilities or redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crosswaysrecruitment.com/userfiles/file/wemowimufugatilipubup.pdf In PDF document text
    • http://ltmetal.com/userfiles/files/zotikufevagozevoxofewum.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/90487413595.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/fenisamosogifirevop.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/jerebunasu.pdfIn PDF document text
    • https://hinaweb.com/upload/file/20942314033.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/notajenivanejunuri.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/71414822868.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gagaziwoxakijusa.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/94318404703.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/joropigajodepapofujulewas.pdfIn PDF document text
    • http://wych123.com/upload/files/loxoxos.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/memulukukesirusajade.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/29898950917.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/zuluvisuzimaxidonagexes.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/wufalunepibisadote.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/41405057993.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/91057947164.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/zokinidolarorupo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e60c984f7---wixorav.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/sifofotilumepowuwefavuw.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/76219575035.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/47856063707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=casting+laptop+to+android+tvPDF 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_off0000bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 10532 bytes
SHA-256: 75eec152982709212c0ccf21d9f8e35c21534686660163e6240166ab6638b32a
font_01_sfnt_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 16440 bytes
SHA-256: d52ffe30bf5f1f43e333828f1fdb1c1c0c09019e740955bc28c3e8bc32e5e27f
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1