Malicious PDF — malware analysis report

Static analysis result for SHA-256 979ae52f693496de…

MALICIOUS

PDF

78.5 KB Created: 2021-10-10 23:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0ed27c228ee67ec595a6815a6609a464 SHA-1: c08c81c4be7eae65c86327588158ed8726e1dc38 SHA-256: 979ae52f693496de20846ff208669565fa9bc0f0b0cf38ade371e4a9719a84f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of links to various domains, many of which are likely disposable, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery, likely via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615db1612bca5---sebulelek.pdf In PDF document text
    • https://dalba.net/other_files/File/wamizi.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/30760829235.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109111335216488.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/tidenuxame.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/tenodepifejalopa.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/35508074951.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109042107562064.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wabizokafenubekimurivus.pdfIn PDF document text
    • http://telangana99.com/userfiles/file/vejunejupivelaxuloxafum.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/nagusamozezamimewute.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/zezopi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/77547470988.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/85056420959.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/22727697064.pdfIn PDF document text
    • https://manenshop.com/upload/files/duzanedatudevu.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/gafitazigizepajewinela.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/95181740210.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/44307682773.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/81596561561.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/9163838542.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/lozugatadavirijimok.pdfIn PDF document text
    • http://rollaktif.com/images_upload/files/20496829286.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/48664477548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=alvin+and+the+chipmunks+full+movie+in+tamil+downloadPDF 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_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 18600 bytes
SHA-256: a83606a380ef6002a7f82147ba3343ec6754cee3b556b2268396c947e21911c8
font_01_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 11108 bytes
SHA-256: 775afb3f496b762eab924be894c951ed60dcf861c6098c8f05bb26350efcb2f8
font_02_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1