Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30dbce3b0760ed1…

MALICIOUS

PDF

63.1 KB Created: 2020-11-20 11:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25830a8e4c16ff9e6d26d50bc093b140 SHA-1: 19cc305d6d7d8948819e1ac34ce4145b0a7a1dc4 SHA-256: b30dbce3b0760ed161b706426fe9061305960abf6bd72232f0239ac5a916f570
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/strik?utm_term=essentials+of+lifespan+development+5
    • https://kewojifusufiw.weebly.com/uploads/1/3/4/6/134662328/kakalizabanewurox.pdf
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/8328469.pdf
    • https://nimomobef.weebly.com/uploads/1/3/4/4/134458394/nevewi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e971c8d4-c340-4a9b-9788-98ab7387b03e/fogip.pdf
    • https://uploads.strikinglycdn.com/files/fa6aad4b-de74-4307-9fca-ebfcb07340b7/mupoxezujizo.pdf
    • https://uploads.strikinglycdn.com/files/b507e2f4-88de-4b52-8f8e-e1bcbbd2ee1f/15998887345.pdf
    • https://s3.amazonaws.com/sugowubuf/43695573547.pdf
    • https://uploads.strikinglycdn.com/files/bfcf4d9a-d75c-459e-9c49-f0f3f84c1a3a/kovokukan.pdf
    • https://uploads.strikinglycdn.com/files/6666ee15-b4c5-4b2a-a46d-56b48f13e55e/lanix_titan_4230_manual.pdf
    • https://uploads.strikinglycdn.com/files/6bd3c420-5e82-4b30-8c1d-8fef574e9147/nine_stories_j_d_salinger.pdf
    • https://uploads.strikinglycdn.com/files/6f207b23-bc01-4153-a874-77a5277e72d7/73015438962.pdf
    • https://uploads.strikinglycdn.com/files/0f63b529-fa32-4ea0-a2e3-084f094ef2eb/zevezekirixi.pdf
    • https://uploads.strikinglycdn.com/files/89ba0d63-d283-48ed-bdf3-d50d9cb510bb/likusamezap.pdf
    • https://s3.amazonaws.com/retisovojor/duwelex.pdf
    • https://uploads.strikinglycdn.com/files/8c87f2f6-8f20-45dd-8106-4c21d563eee9/putelakugigiridobena.pdf
    • 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_off0000bac2.bin
69f2825a91900771946b6994bd55b67df60ddf4d2722c4b02a3e82222355b34c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 5232 bytes
font_01_sfnt_off0000cc94.bin
c3d3b283c44cf4dcfb3e4ebdc690ac42c0a25289f56e2a443ba7d281cb3deae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 10480 bytes

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