Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffeff36e79bcd54…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 23:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd83867d371d6ddcc93bd0297d47cf1b SHA-1: 243b014c51e26f24f33bbb6e9dcbe3ef2bb43d51 SHA-256: bffeff36e79bcd544237ad1a6bd38581bcacca7263d6329801271a52dd1c6e42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=single+horizontal+bar+graph PDF link annotation
    • http://kool-house.com/upload/editor/file/woneleveluketuguvebopepis.pdfIn PDF document text
    • https://partetesal.ir/data/file/tepamudunalabepo.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/bumelemepogefadoposune.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/11984295463.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/mutebipekaxez.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/83030645634.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/39614456247.pdfIn PDF document text
    • http://didula.ru/img/file/6057853303.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/xefem.pdfIn PDF document text
    • http://markone-tools.com/upload/files/42529903577.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/wapibinogelusuxiwiwugeb.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210911153249_1314741762.pdfIn PDF document text
    • http://halaljones.com/uploads/files/49171528170.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/sareme.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/87778086311.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/wusirakafagekepidos.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/noligibedorisirodavafu.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/xojixebesikarabanawof.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/27404837905.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zumidexezeroralilorokupus.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/12963486736.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/50072264390.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/53098759755.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/97147420891.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/forefavolebidum.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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 10640 bytes
SHA-256: 1a3198b883ac4d87f3e6d33d0d1e140a1328af578ae1e8b9856ee3c30dfd5307
font_02_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 18380 bytes
SHA-256: 522bfd419bbeddcf4c91c3428d2ca8449124bd612751c95d93af8c36bfee2f04

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