Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c39f7f32b71d08e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 17:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 561c8553d395530b3259c682567dfec3 SHA-1: 732b86a9c61a71098cec61e2dc706291c5830ef2 SHA-256: 2c39f7f32b71d08ea76271c30d6a6ee0a7f678b8d661987046b4b2afdeae168c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, containing numerous links to disposable domains, suggesting a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent, likely spearphishing.

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 http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613755d013b0a---pirini.pdf In PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/begavuxadubulusinamovet.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/jerululagisamalubakisaja.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907183223601942.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210908212128_1521007211.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/xulozebewul.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/bofagabum.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/vajuduzefimiravamo.pdfIn PDF document text
    • http://darec.sk/files/files/24727450666.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/lusajurudakurivupugiteg.pdfIn PDF document text
    • http://grimastone.ru/files/60162342144.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/46481199248.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/zezugaxiletasivekakusaguv.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/5025393947.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/paxunenozobomebixuzobu.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/xijepevadixatusek.pdfIn PDF document text
    • http://orthodoxnews.us/file/lixaxemurakeboge.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/ditavudegofos.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jukag.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210909_B06EED7C87A2601A.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/giribejupije.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/79488132502.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/sifemazukegebozebiw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40c5d509b---86946155419.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/11643976170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=google+locate+my+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 17272 bytes
SHA-256: b088a61686a5de485a1c006781ba22f9e881aa7737a54436aa0b2e27cab2e6d4
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10700 bytes
SHA-256: b9b79fa687cee46b87dd1fded47a76d07f644e29b0ee8ffa681456e483e06774
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1