Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf60d3dda6ba2d1…

MALICIOUS

PDF

83.6 KB Created: 2021-10-09 14:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69b18f8e236f92d9660f18d251cfd8c3 SHA-1: f56de9c348449f0de3e2191ae50f653f38c043e8 SHA-256: bcf60d3dda6ba2d18e3697fcc439250ad2d16a1566ff21e7767b218fd8268aa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many links on disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the overall structure points to a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=what+does+sperm+look+like+when+it+comes+out+of+a+woman PDF link annotation
    • http://etnorom.hu/pictures/pisuloto.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/72102419486.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/98863251237.pdfIn PDF document text
    • http://risme.vn/files/96033174119.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/kasazofabisovev.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/56693092007.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/50517607524.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zukewefizizagalababigito.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/rojudaruka.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/munamalasegerunojumoruv.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/18337935648.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/74533175098.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/zifivumujesabawijade.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20211005191353.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/33309489467.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/dozimawipamodidozapojabut.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/jebapegedun.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/sarokokelozok.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/43867979017.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19ca69dbd---26904763552.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/vobowame.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/15585577722.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/71153905271.pdfIn PDF document text
    • http://iccarrentals.com/files/file/89160322080.pdfIn PDF document text
    • http://pileki.com/imgup/file/zewaxona.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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 18696 bytes
SHA-256: b02b49d8b87dbb312803b6298af73893b059308adef51e40d6cade2bb997ac33
font_02_sfnt_off00012695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12695 11156 bytes
SHA-256: 3f03114ebb6cc2e4d161ed9a65c3f716dc06a8fdb486c3d5eedcf8a29708bee1

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