Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbee2d705e2bc199…

MALICIOUS

PDF

84.8 KB Created: 2021-04-22 22:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2bc8216e64b07bc837d87a6c5f9f3516 SHA-1: badae3ee0fce63d33f83c30f3e8b5a62e0ee9423 SHA-256: cbee2d705e2bc1995908192ba8627334acb999aa8eebaf5e1b91b09b7ee49930
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing campaign. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a high likelihood of malicious intent, specifically a free-download phishing lure. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=sfsu+dorm+fees PDF link annotation
    • http://demazopozegefo.22web.org/bangalakshmi_torsha_today_result.pdfIn PDF document text
    • http://pearhaidhr.fun/8565638029hcs2i.pdfIn PDF document text
    • http://slimerecipe.org/29507652339vb0ib.pdfIn PDF document text
    • http://avto-document.site/java_1._7._0_64_bitw6dyh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_4e751f25860f498781bdae0a61b9f6eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/dilonuneseliw.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_daf39e0c6c9a4cdf8cb2c4998897f2d8.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_3841be68e04043979dc2ea789497fea9.pdf?index=trueIn PDF document text
    • http://jajowisomipuw.epizy.com/free_branch_manager_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/29920829133.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_f302877b40da45d684adda34636d51e1.pdf?index=trueIn PDF document text
    • http://makosowuru.epizy.com/how_to_cook_hard_boiled_eggs_in_electric_pressure_cooker.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_12bd944216574dc3a337030abb844b0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/chill_r_b_music_free.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_f06d619086184f1d917c9c001e0212a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/fewivokasik.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_a62b1064c6034eebb92b57003a140cf6.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_709af8b694d84497abe9fec05d15c4d0.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 4912 bytes
SHA-256: d57c4531297b1ed83ead0ddad87db8b9f9ba790d9285c237b6664008f4d26293
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 11892 bytes
SHA-256: f4a342c3ed22b4dab69d19547a3865048891ee709ca5f326dae32df17a66b77e
font_02_sfnt_off00012fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 16068 bytes
SHA-256: 5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6

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