Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f963d1180af298e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 12:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3db4398ec4ed84d72123eb035d54c366 SHA-1: cd8e6af40aa7691f09563ffb33a38f0268038c6e SHA-256: 2f963d1180af298e1030a071368d1c6f6f728237d0ba1b65ac804f284a69baa9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://jca-t.com/fck_image/file/godiwerubeputopoguxobuwu.pdf In PDF document text
    • http://unstitchedfootwear.net/files/file/nubulofudaxuxudamitexoxip.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/62213685063.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109041905058226.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0ce8a8d7---tezesewuzogoverex.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/fexapakegajuvuvobevu.pdfIn PDF document text
    • http://cityfate.com/files/files/74626208927.pdfIn PDF document text
    • http://kdekdyjak.cz/data/51114068653.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/lemedaninipisutel.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021911524245352.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/52549453628.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/89937896970.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/30862145731.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad8da52dfa6a9aba0d426a050d44e88b/55763100366.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/nanuxabuzexete.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/80058332945.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/58559784504.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/95829441209.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6138e29201489.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/79965250952.pdfIn PDF document text
    • http://kahasat.cz/data/file/97257742843.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/81108934574.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/juzena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=disable+incognito+mode+in+chrome+androidPDF 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
font_00_sfnt_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 18696 bytes
SHA-256: 4fec77e439d7b1fb93a0839c878b5a967fe07e3cb65ae216aea9189990b85b66
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 10960 bytes
SHA-256: 46762f02b12d2edcd5c03c72b422691c56f41bee0e1daa212611f4163cebef9f
font_03_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 17096 bytes
SHA-256: 31a1b081fa3088af171d603d66ab1f93d34d89b78e3469ad0e62ede2194a29fb

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