Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb0788c8912cec5…

MALICIOUS

PDF

82.8 KB Created: 2021-10-14 09:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f9b91887a8ef4fece74f3a84f9976e4 SHA-1: 65d181667cc741ae8302b97c1d4b4ff38bf31858 SHA-256: fbb0788c8912cec5c5c2ac1f45cb02449e9bee05e3ba6c5a41c85f9bbae8502c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=best+waterfall+hikes+in+asheville+nc PDF link annotation
    • http://jr.ac.th/ckfinder/userfiles/files/4062964097.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/15895108012.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/tojiritufaz.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/55713245061.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/19333177638.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/simogegawekuzuji.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/77095071524.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16163b795ee9d6---32036736792.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/lakiwigibodetibadinat.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/45700895871.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/badogamalibap.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/54178869426.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/71880533631.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/50083265753.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/32807399569.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/jifabuxiwuvaxogirovifaw.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/13237576316.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/jigejavugujoxuremevizumef.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145648458d37---79958170806.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/6022360443.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901152646.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ilejos.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gijajafafuratifekegev.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/nokelotiviv.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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 10608 bytes
SHA-256: 07f367519099742ff41ad73d0209691a36e22353f66ef09457b30764f5dc29d3
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 17372 bytes
SHA-256: 54be22528e369bab0675bc213955bd7f6e64395069cb60f6bbb170574721b81e

Open this report in the interactive analyzer, or submit your own file for analysis.