Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7f545f9eb42718…

MALICIOUS

PDF

74.9 KB Created: 2021-04-02 22:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 630c5847a1945e2c4685e65898f3ebe4 SHA-1: 921ebb6cca8baceb395811149b31f1a22fed6226 SHA-256: fe7f545f9eb4271862f1891ec222e9e0bcd106cf35a7e46276a5aa4b8332210f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, a common tactic for SEO spam and phishing. One of the extracted URLs, 'https://dugedepap.ru/strik?utm_term=basic+linux+commands+interview+questions', is flagged as unknown reputation and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=basic+linux+commands+interview+questions PDF link annotation
    • http://curvepreloved.com/las_vegas_vacation_packages69afi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a494236-0861-415a-b4d0-fd6e1c8f4401/80106909335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973d45ae-a2d7-4545-889c-a413d5c5dbb7/4541974992.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_fcd74ce6661a45c1953d645c0c7ec0ed.pdf?index=trueIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_7d556438bf5b4743ad40d09ea47dce92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8169cb02-a9e5-4a0a-bf7f-9e9e79260120/interior_angle_of_regular_polygon_having_n_sides.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_f053bcbee9d64811a030ad043f671dcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/924aaaf2-d6f0-4591-a788-bf3f0178fd61/14401484732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70da2dc5-57fa-47cb-9f21-62d6c9d83d73/xobezonoxuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7acf7339-ce28-47ec-9eb6-a3372e9ad4e4/watch_la_la_land_online_free_dailymotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/367276dc-488e-488f-a700-a841182d5dc3/vapuwinugazoriwalus.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_789bd15807014f029ca2770af4064094.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_15c8d21de61f489494f66c773b9d55a2.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 5480 bytes
SHA-256: f30eb8ce68818ac35f7c386fdede49127a01bffe19db8839e01722239253bf7a
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 10740 bytes
SHA-256: 2ae90be04de4246de291281b0897f438d68cf978a98b41a3cc1b567e17761170

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