Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3c5931d1bfb5dd…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 08:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4080b9675cd0b08297eea1a77c84e0dd SHA-1: b9429a20a2a38e0aadc471676ce5cd71a4eaca58 SHA-256: 1d3c5931d1bfb5dd0f4d041760cfeb870868ef19ba1c8c4ba525fce4df467ec7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to a large number of links on distinct, potentially disposable hosts, suggesting a broad campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=data+plan+for+mtn+android PDF link annotation
    • https://anyimaker.com/upload/users/files/85847876340.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/koqjrj31k5b0d9fhnmapa564l4/fiduraxurixepun.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc6e76a662---zawadone.pdfIn PDF document text
    • http://gemtown88.com/PicOther/file/vorugos.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/razafopus.pdfIn PDF document text
    • https://ambalatender.com/upload/files/82157032649.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wapetonugiruw.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/96864087845.pdfIn PDF document text
    • https://polandpools.com/contents/files/96542643197.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jeteruxijugepavisuwawiv.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/56336920570.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/pitez.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6142EFD7CB846.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/kapatiramawifafibonuvo.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/lubulokawovitakoxop.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/kudibezenekote.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/19576988969.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/tobajitetujexu.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/25201433612.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/17035624184.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/3741953543.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/7095162685.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/11935270574.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_off0000af47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF47 17588 bytes
SHA-256: 75e478c001940071e91aed33c03859877e03c44b776a5f46266d95824855bd7a
font_01_sfnt_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 10360 bytes
SHA-256: b4ac9b3348fdaab6a5715e33a6e910da31bf3379c295203065b5972093465b9c

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