Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fe8c6a3aa38251…

MALICIOUS

PDF

70.4 KB Created: 2021-06-05 09:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcfcdbb4ef0d51609ce325de66192c84 SHA-1: c118e052ab19485ffbc2a01a711452a8bcc99cd3 SHA-256: 23fe8c6a3aa3825165a4fe4dbb16871a7c9a6903c41ed215c72030b87197bde7
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 of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

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://catamma.ru/pbw?utm_term=how+to+write+20+hundredths+in+decimal+form
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/jenepage.pdf
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5ff76f93ac4af.pdf
    • https://cdn-cms.f-static.net/uploads/4404113/normal_605ef93eb656c.pdf
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601bb34ad6943.pdf
    • https://cdn-cms.f-static.net/uploads/4410214/normal_60b7ba3907993.pdf
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5ffeb728db1c2.pdf
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/tukadiz-vivuw.pdf
    • https://cdn-cms.f-static.net/uploads/4494677/normal_602ab84803d77.pdf
    • https://tibomomaludo.weebly.com/uploads/1/3/0/9/130969572/zagebumol.pdf
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/1484824.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10476799-b816-4fff-8825-17d128f355d2/download_twilight_new_moon_full_movie_mp4.pdf
    • https://uploads.strikinglycdn.com/files/cb20deab-37bc-4397-9570-96f7dd2cf9a8/27645121819.pdf
    • http://xutipofapu.pbworks.com/w/file/fetch/144550290/google_sheets_vs_excel_download.pdf
    • http://xizisimavi.pbworks.com/f/how_to_find_area_of_two_similar_triangles.pdf
    • http://molitutolu.pbworks.com/w/file/fetch/144545823/58817942905.pdf
    • https://uploads.strikinglycdn.com/files/f7a024e0-90d0-41c5-a37b-d96bee358f9d/kenneth_cole_reaction_mens_watch_black.pdf
    • http://kigemulu.pbworks.com/w/file/fetch/144565512/does_block_puzzle_pay_you.pdf
    • https://uploads.strikinglycdn.com/files/62df7a2f-2350-4327-9a72-b85cb491aded/what_are_the_best_websites_to_learn_python.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_off0000d46b.bin
8afe99246a245ed48ea206cc16bbe9ad569c317dbf5c0ab8c60f851e9ce72982		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46B 5588 bytes
font_01_sfnt_off0000e74b.bin
046135a1b818c09ab5c97b67621836b8a30be7c6ca911a5dfc30167c2e671a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 10808 bytes

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