Malicious PDF — malware analysis report

Static analysis result for SHA-256 578126f52f56f6df…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 13:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41e1579421b10a9aed9dba60898e18a6 SHA-1: cfbc05b1eec39ec485c41264f6f1f0dc0f7b6675 SHA-256: 578126f52f56f6dffc24c331241eaf92c4efb2556478b02db36070a9256cea18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to redirect users to download potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://alutat.com/data/file/57775743062.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4674add4e---zotuwi.pdf
    • https://bold-iot.com/uploads/files/202109030401244406.pdf
    • http://danieldesignpro.com/userfiles/82907873720.pdf
    • http://ouhkpthaa.org/userfiles/pivitufosa.pdf
    • http://gianniarnaudo.com/userfiles/files/8719792503.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/16908899950.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/41743269348.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/nofalejusurepiki.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/zobomovesiburofuvipine.pdf
    • http://alrabbanoilandgas.com/file/files/69562288908.pdf
    • http://americansemitruckparts.com/d/files/kuzizapasu.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/98580242864.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/birobuzitewelubokodopuj.pdf
    • http://topoint.cc/userfiles/fckFile/20210902231637.pdf
    • http://abbuffalowings.com/uploads/files/3258335668.pdf
    • http://chuanghuilaw.com/filespath/files/20210902124346.pdf
    • https://divetechmarine.com/contents/files/vapovisemozalotorefejopi.pdf
    • http://cascinamana.it/userfiles/file/89364268106.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7tq889hlbbql42a6hhndgg3uvo/mugabusoko.pdf
    • http://tuzy.pl/Upload/file/fopalebabozejokuvira.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/19597617052.pdf
    • http://dd-eng.com/files/files/75022482674.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fifa+2020+apk+obb+offline
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa0.bin
08fbd838295adccb13be4d41fec0ebef51473d2fe4e06fd5c042a33da9bd58ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 10436 bytes
font_01_sfnt_off0000e21c.bin
723b6ae272bd420fdd2123e2c3ea1d004914e2ec2c0e307b68b1d5eba590a782		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 17812 bytes
font_02_sfnt_off000110ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 16792 bytes

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