Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecfcfc2218b20f0…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 03:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e5d2c2577914d7cc54918c37c947b96f SHA-1: 199bf8f4027b34f98eb24cd5acfa936c4f80a464 SHA-256: cecfcfc2218b20f05c2d59511f25a9b85efb0b7b280f9da833c6e6f99bca5116
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a large number of external links, with one pointing to a suspicious domain 'gimoguvi.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=descendants+2+what%2527+s+my+name+song PDF link annotation
    • https://xonunomimir.weebly.com/uploads/1/3/2/6/132681278/1999085.pdfIn PDF document text
    • https://xedenuxukufokar.weebly.com/uploads/1/3/4/5/134522900/0585ebf184aea8.pdfIn PDF document text
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/d9c43b4bd2d26e.pdfIn PDF document text
    • https://nenubijul.weebly.com/uploads/1/3/5/3/135393623/soxozuzunobugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/how_to_do_a_negative_scale_factor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba97aba-5699-40a5-bf2c-1aebca6e80e9/22226216998.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/16373892555.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_afbdd351cef64da289605ef15cdfbbc2.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_6affc1b4e8bc4a67974b0fede14e4ea6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/2366831959.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_6e7ad84dcdf44a2fb099cf4185520eb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/lillington_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/mineporelevevojo.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/el_pollo_loco_large_tortilla_soup_calories.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_b3e9c41a554140a38a1960097e85c24c.pdf?index=trueIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_1248865dd8484ea38031de8a4bc154c1.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_688c6cba69844abb9c03459901d166df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/banjara_movie_filmyhit.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_4624cb8cf3d24a18861f657b85357f58.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_b99b9d56e9fb40b696e8fb8961cbdf52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc264f59-7a7c-43d7-bf79-3957fd2d4820/razexof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1f06c3-2282-4f6c-abed-e3c764bc3479/praise_and_worship_songs_2019_south_africa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 5584 bytes
SHA-256: a3b4a1a7f689cb07b35ec49abe34163c4ac6a71675fc6cf7bc357b624c129072
font_01_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 11072 bytes
SHA-256: de8ca92de4885c000ea5214d9fe53169beaa7e4782549414b63faebbb919902e

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