Malicious PDF — malware analysis report

Static analysis result for SHA-256 44738d44bca578b9…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 08:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cb53291a99ab0703ba87ea4924dbad3 SHA-1: 020a5a1532e8b27952a46557c96b6460807ce57e SHA-256: 44738d44bca578b9afab88e91e0ce9f73fdd806a0e9ea86ec6f67e94e1734ceb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, as malicious and likely phishing-related. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=techno+pop+4+air PDF link annotation
    • http://runbo.net/upfiles/files/16305587215317.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/rilipibujanopezutabovoxew.pdfIn PDF document text
    • http://langyupharm.com/upload/files/zoradivinigorikalidafa.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/2629537841.pdfIn PDF document text
    • https://zzwgjx.com/d/files/38160529898.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/41576115275.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_119D5AD87F834018.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/zosefidoxilotawomud.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14510689970.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/latevigakenimubenuxivow.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/zuxituvu.pdfIn PDF document text
    • https://latework.cz/soubory/tufamelo.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/66706790854.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wazizixetitag.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/lazuwadezale.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/welujivisakorivob.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/22510583638.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/98210558956.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/61018685582.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/33477807407.pdfIn PDF document text
    • https://terracell.info/images/file/fozadiverigimurajaxojizi.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/74018281843.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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 16128 bytes
SHA-256: b85d78d2fdb6ca6d72e5752b92ec2a18dc27ef57ffa9cdd692b2b71d6f1b7be6
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 17344 bytes
SHA-256: 580c81df944382acf3f0eef6bddeef50919af7029041ed79c8086f8d0c5510ec

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