Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1f7ac385b0c04b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 02:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d546e8773bae7480d2fa65da943b7cf5 SHA-1: a80e14e87e0033204dd6297bee5cd0905b69ea3b SHA-256: 1d1f7ac385b0c04bb8f8fca82795f36026e81f67c7cca4ee1e9ddb690d979ec1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting. The primary attack pattern involves luring users to these external links, potentially for SEO manipulation or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ochronaskory.pl/pliki_user/File/88730990895.pdf In PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210912_9CAB737DAC02772B.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/seronusukize.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/fediluli.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/91036745670.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/6475140255.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210913100502.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/jetuja.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/1250560614.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/bofupewazaxevolabibizek.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/xadixasaxoja.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vidavapixodevidigase.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/75047235090.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/93145305344.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138519800750---74416088791.pdfIn PDF document text
    • http://opsir.eu/files/file/43147093114.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e6c85384---fasewimebejozuruxik.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/76758259648.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/wugexexinarofu.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/67812976116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+note+10+pro+geekbenchPDF 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_off0000baa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 16656 bytes
SHA-256: bc477e7cd48739c8877c9b00ad7ce5c425152af2c4756e7da79dffebf0c5a8d8
font_02_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 11036 bytes
SHA-256: ed5763260ecf3e1e4e63204191d53ece99fb79706769429e4fd3acf0884969cb

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