Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb4591fa22e05c9…

MALICIOUS

PDF

83.3 KB Created: 2021-10-04 20:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45b8ba1ba53ca1f67d30d4ca4bbd7c9e SHA-1: 5f97df7f34915e9320395137678607a70e70e213 SHA-256: 4cb4591fa22e05c96cb567357e14359644a59c75ba9ff5201a6808f0681727d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to other PDF files on various domains, suggests a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://webkapper.nl/ckfinder/userfiles/files/jimazozex.pdf In PDF document text
    • https://tradingphrases.net/userfiles/files/53622565970.pdfIn PDF document text
    • https://hssanesteban.cl/files/61077413108.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h02l5ujcph61khv40r4uivopl6/lepelagojonakabi.pdfIn PDF document text
    • http://hoogbegaafdennu.nl/userfiles/file/41185649196.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/d8pn9g2s3p2v42a5akbcp2jls5/bezuran.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/kufaxitadenu.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/56961885178.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/lenafisolowoxitam.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/53017588557.pdfIn PDF document text
    • https://aromamarketing.md/img/files/rexevelanusa.pdfIn PDF document text
    • http://sinners-party.de/media/file/76473132566.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/30254841125.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-10/file/2021100318042473499.pdfIn PDF document text
    • http://safarang.com/basefile/files/pevojib.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210904225541.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/9341593765.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/84017843761.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/zizazuw.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/sojasu.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/90323054703.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/51175492377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tom+joad+quotesPDF 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_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 18432 bytes
SHA-256: 094bcd3533d3a550743ef2df1564374a1af15b5508db6eec6df001890a1dacfa
font_02_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 10404 bytes
SHA-256: be02bfd69387c2be1c3a5e6afb663ce6ad1aefca968336b75a808bcee7dd542e

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