Malicious PDF — malware analysis report

Static analysis result for SHA-256 480fe12aed8c40f9…

MALICIOUS

PDF

80.7 KB Created: 2021-10-07 04:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b19b740f6a0ef7e8cb46358620196b0 SHA-1: f949465bfb6629d7d5d16e478e9d6426c99b4094 SHA-256: 480fe12aed8c40f99179e150473d5adc1e32b978c4201a8e04020677bfe550c0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to an IP address and another using a "utm_term" parameter suggesting a redirector, strongly suggests a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=convert+pages+into+word PDF link annotation
    • http://sdes.in/uploads/68402143626.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/23230167579.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/59452311836.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6ab33bab6dc3400f022391201f0d25d7/funuxirigiravenalakajuzow.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/11959429695.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/doziverelofomalamabunuj.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109271943552001.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/gojofonifaxazesibevaxa.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/43083177461.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/vizel.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gojusefurovigolo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/13352162223.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/69543010393.pdfPDF link annotation
    • http://kiavysocina.cz/UserFiles/File/sunapapupunula.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/tajemoned.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/69774240945.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/leranokofinusezini.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/21637450783.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/96538578496.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/501101_93120973725.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/wuleraxetasovozapigixuj.pdfIn PDF document text
    • http://dentherapia.hu/files/file/sobasi.pdfIn PDF document text
    • https://fasleh.net/Files/files/lugadu.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/xidubewokurojevegof.pdfIn PDF document text
    • 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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16848 bytes
SHA-256: 546b1174bb60956e23991b3c4080fe9762d8f4df2f530f569a3c652daf6c46d3
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 10704 bytes
SHA-256: 565de714c31809d7bc2b4529c2d225002dc82584fb9123335d7d025d8fe4a1f6