Malicious PDF — malware analysis report

Static analysis result for SHA-256 7675d9b7d2099079…

MALICIOUS

PDF

80.3 KB Created: 2021-03-28 07:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ad9d3c12446cc6108f06c428fad5d0 SHA-1: 7b33d2c22e726c0c0a3d6ff953d23e8fc97244f6 SHA-256: 7675d9b7d20990790329a74723147634574de08c631cd6a7e3b59fa5e0e444c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=celebrate+recovery+lesson+7+sponsor+pdf
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/basinolewubis.pdf
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5fef870426c2a.pdf
    • https://cdn-cms.f-static.net/uploads/4455898/normal_603fb49d5dd7b.pdf
    • https://rivupabageram.weebly.com/uploads/1/3/5/3/135323939/zawaredufupapug.pdf
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/308935.pdf
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/6268978.pdf
    • http://xebubux.sportsontheweb.net/25687822225.pdf
    • https://cdn-cms.f-static.net/uploads/4367278/normal_60511a11a3317.pdf
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/guvisig_wedoro_dutasexesew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zobuwubedak/punotefulupowatoxudijawa.pdf
    • https://uploads.strikinglycdn.com/files/5456f3d0-bba6-4814-a6ec-66cbf7d1d1f6/difference_between_ruger_lcp_and_ec9s.pdf
    • http://pulutugorivexek.atwebpages.com/letter_from_a_birmingham_jail_analysis.pdf
    • https://s3.amazonaws.com/tuxenipup/fijavepuxutumojeti.pdf
    • https://s3.amazonaws.com/mixanaz/81371910977.pdf
    • https://s3.amazonaws.com/dovulavavo/76003968809.pdf
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_78289178b7314739a4fe66d481d767f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/16c3ba51-ced0-4cae-a31f-2fcbfa4cd3fd/mtd_snowblower_carb_cleaning.pdf
    • https://uploads.strikinglycdn.com/files/d7c22c58-eb12-49d4-85b6-84623dc54e55/derodav.pdf
    • https://s3.amazonaws.com/devuxuzejozam/70062593513.pdf
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_05f740aa196242aea27f794aa8b4f4cf.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fadf.bin
f8ef1a0118f19ae8b4b5da2dbb7d4e5ee64396c89009ff76ec11f98eb74d988f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 5436 bytes
font_01_sfnt_off00010d75.bin
8321926d72c0b3860dee0e3678c5f5420530cdcf4311ffb6dba9433729128354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 10696 bytes

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