Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c55c4444cd5859…

MALICIOUS

PDF

69.3 KB Created: 2021-09-21 14:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6e48ecb32ffb7cd77a76ca56c3aa621 SHA-1: 59b1080f98fad2327cf11524b76cebef753cc3f8 SHA-256: c8c55c4444cd58599fac9ef4960b972442205a8607d191fdefd148f8c6ac46dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, suggests a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.meditech.cz/ckfinder/userfiles/files/84876754382.pdf In PDF document text
    • http://noithatphathuy.com/Images_upload/files/junobarubazufenix.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161496663845ca---81027574535.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/61139063990.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/wovonofapawukin.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/dolenokalakemadukiteda.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xelasubinukagajuti.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/nabiwulavolakod.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/15449187437.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/dubabinipeji.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/zuketavej.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/30647157804.pdfIn PDF document text
    • https://ijp2.com/contents/files/40946866308.pdfIn PDF document text
    • http://quinta.cl/upload/files/digatoludobasuw.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/xiluwubejojevixor.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/59235355149.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zibenevepedoteposudulamo.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/natewevagagagexirabek.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/33403201826.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908022849.pdfIn PDF document text
    • http://soupworld.de/upload/file/73072690445.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/30963514223.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/loloziwe.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/vonafanagawab.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/50397800296.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fefeb8247279f1c53c54bc9f997fa493/wowebetexarezirexepax.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/22064332724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ios+pvp+gamesPDF 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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 14996 bytes
SHA-256: f940fd9cd48da3628400377864218ebb58467fceca06c1b2a966cbb7795f024e
font_01_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 10172 bytes
SHA-256: 2fcc36a0d2e2a1bb1f80bb377932843d3bf25ba42a558fbdadaa97129fd5e10c
font_02_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1