Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac6f119161130ad…

MALICIOUS

PDF

73.6 KB Created: 2021-04-01 19:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cfd555ef7ecdaa018441123bd9aa2751 SHA-1: de284a29c7a2861633cf00145be12754bdf9673e SHA-256: dac6f119161130ad63a97808a94e25b633235f9fdbc489a3bd531d009c1a3a07
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the primary external URLs, 'https://lozipotod.ru/award?keyword=ethical+considerations+in+conducting+research+pdf', appears to be an SEO redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/award?keyword=ethical+considerations+in+conducting+research+pdf PDF link annotation
    • http://mateguwokalidub.getenjoyment.net/10685730481.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/11710580936omzn5.pdfIn PDF document text
    • http://wersita.fun/neumonia_aspirativa_en_pediatrias9pxa.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/13731577054.pdfIn PDF document text
    • http://presalle.xyz/fozodo7i8l.pdfIn PDF document text
    • http://wtia.space/favakiwagekuvojelazupulerlh1k.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/ffe23d3d-67f0-42f2-adac-a3192ebec206/3242266111.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/streamlined_energy_and_carbon_reporting_secr_scheme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d457bbe-fa29-4836-b229-746f628ab2cc/botofolaxuvutobi.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/podocarpus_bonsai_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/the_hobbit_book_to_movie.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/86105811044.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_f351bbb32ddb4426947b4e7bcb5e0db4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/how_to_write_a_rebuttal_example.pdfIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_4e5e98d97c21493bb22a45ea4821dc38.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_8b0cc52ea61d4b489c177af3356c16e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/john_lewis_bed_sheets_and_pillowcases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef19f10-5161-48e5-9014-64b52f029dc3/76766092329.pdfIn PDF document text
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_a7eccf41aafb48578f55d34d7308159a.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_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 5376 bytes
SHA-256: 3b8c8dfada67921682e7cde79590e90ff2e5efa8cce8620be1f34fcb8a51d18c
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 10136 bytes
SHA-256: c85c9ae70734801260573229d5d2ade42e17dc89835b4b6f977243ca59ff882e