Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a879dac0c9bc8bc…

MALICIOUS

PDF

82.1 KB Created: 2021-03-12 18:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f93c3d3d6c5e52596aa64abbdd2cc1ed SHA-1: 194c663cfa901cbcf5d6b0f7d3842868823e7e9d SHA-256: 9a879dac0c9bc8bcb56593de6084a31b0de882fb9f4087076838af1ff5a23c0c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/wix?keyword=the+disaster+artist+greg+sestero+pdf PDF link annotation
    • https://ziwodenitisal.weebly.com/uploads/1/3/4/3/134350364/6030630.pdfIn PDF document text
    • https://liwetevafiwa.weebly.com/uploads/1/3/4/0/134096648/jowedezudilurazupoga.pdfIn PDF document text
    • https://jibukasuji.weebly.com/uploads/1/3/4/6/134657313/fd00817.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/RjeqWhd/halloween_wallpaper_desktop_pinterest.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/vixuzoxusod-dutopibolutazi-tokafizosunimeg-zejemunisizer.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/tijorejofesonupom.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/ifwgdjc/dakelipojexalufozexe.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/5fa2d714-52ec-484c-9d2e-d72986caf98d/kotopipeton.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_898e818e3aa247609e2aa146f876b8a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/simplifying_algebraic_expressions_with_indices_worksheets.pdfIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_c29a23b92f734d729eee8f21ce5447f6.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_b144040f2ec94bc5b076a1346877d718.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/christina_aguilera_song_say_something.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24be067-40a5-4491-8622-3204417ee0e0/how_many_carbs_are_in_wendys_spicy_chicken_nuggets.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_90b0bd82b20349cbba36bf4c624cb02c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/gallic_rome_guide_empire_divided.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/30072103087.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/healthcare_informatics_websites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50cfd417-6f10-4cfa-b587-26c1bee119be/impact_of_globalization_on_communication_slogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d9d883-72c0-4d01-b9d6-29a20ad3b9ee/how_to_be_a_developmental_editor.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_c4be7a2f806f41eb830c37cdf7b57960.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_56d6849173d548f3b6d3d4fbedc5cc1f.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_09415872a026436a80dacfc8bc77d5ba.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_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 5220 bytes
SHA-256: c5044d62bda1f3861864a737a55ea7a5b3a5fc6cc9342e0a87ea236ab872cd61
font_01_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 10408 bytes
SHA-256: a06a90646bb13f157dc1ef2b48c3160267bb431e30351ba6c550bfc3bfeb2126