Malicious PDF — malware analysis report

Static analysis result for SHA-256 88670fa744fc42d0…

MALICIOUS

PDF

75.7 KB Created: 2021-03-15 17:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe1ebe2896d23ccd96f99fe34aa3a8a1 SHA-1: 6a3591299c19729d2691b376961df0715daea0b8 SHA-256: 88670fa744fc42d05c4a8b23825c872348a70ecace2149c46e6a964b13ba05df
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a PDF link farm with numerous external URLs. The presence of a PDF_SEO_LINK_FARM heuristic firing indicates a high volume of links, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and extensive external links point towards a malicious intent, likely to lead users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=weekly+planner+template
    • http://choosenews.space/xaluvadorogapabuzikuwelowcmwyr.pdf
    • http://wiwovurezibaso.getenjoyment.net/is_2.9_a_good_gpa_in_college.pdf
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5ff4eeb0b4afd.pdf
    • https://dubilovatigalis.weebly.com/uploads/1/3/4/7/134701517/vulixazuw-wafus-dapovusafujubid.pdf
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fca734ed7918.pdf
    • https://bunemevomuw.weebly.com/uploads/1/3/4/7/134733911/6175412.pdf
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/7972975d7fb.pdf
    • http://hugertely.xyz/tekken_6_download_for_pc_windows_10raba1.pdf
    • http://wogivodugakovek.mygamesonline.org/html_download_instead_of_open.pdf
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/vuwubozonuze.pdf
    • https://cdn-cms.f-static.net/uploads/4457011/normal_602570952a702.pdf
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/pumaluzage.pdf
    • http://karaulovlife.site/does_handwriting_reveal_personality_traitsar44g.pdf
    • https://falosaxosudo.weebly.com/uploads/1/3/4/0/134017699/6935692.pdf
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/xapanivipo.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_601f80acf03b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a3bbc5a8-55ac-446b-9733-8cf97b38d93f/99578813855.pdf
    • https://uploads.strikinglycdn.com/files/7cb52802-de1e-4dc0-83a1-6156fd094bb7/wevap.pdf
    • https://uploads.strikinglycdn.com/files/352c6249-878f-43a7-ba3c-acfe2759e87f/warrior_diet_daily_meal_plan.pdf
    • https://uploads.strikinglycdn.com/files/e3f633e7-9fc5-4704-9f6e-5e4bf43024a8/gogipokelamisot.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_off0000ece0.bin
ba3cbce7aa042c92b2e3e9696cf7056e05d2cde3357e244754c02b05dc857090		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 4964 bytes
font_01_sfnt_off0000fdc9.bin
aae1fdcf7055e48b710a2b4db7d9a64fc525b92994e01ab91fb82a2a2283efee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 10720 bytes

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