Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e677ca9011b853…

MALICIOUS

PDF

106.7 KB Created: 2021-03-12 09:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90bece74ff94dac0cd22b43a41d33294 SHA-1: 2a1fc86572d0e6dbcdb15545fcfc0d3f31cf1834 SHA-256: a7e677ca9011b8538e55f7b74e8a78f8da876fcd52f175c58d0fd3a159d576cd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://maypoin.ru/award?keyword=formal+language+automata+theory+pdf', suggests a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect users to potentially malicious content, aligning with phishing and malicious redirection techniques.

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://maypoin.ru/award?keyword=formal+language+automata+theory+pdf
    • http://akb54.ru/83398708280x8exw.pdf
    • http://blancop.xyz/can_i_use_my_own_router_with_fios_tve90gq.pdf
    • http://vilopeg.xyz/93168859753n42ku.pdf
    • http://rastet-malysh.ru/68219097761384pf.pdf
    • http://pijakonojimuw.iblogger.org/92163770808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e23c928d-e926-495e-b77a-d915ea3c8f1e/cisco_linksys_e4200_review.pdf
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_cbe10f00dfda4c33be5a81fd02afa4e1.pdf?index=true
    • http://minirulo.epizy.com/assam_tet_2019_online_application_form.pdf
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_9f563093a6dc4f4cb0eeaef6f8ce058c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38d711b4-ba89-4a74-b216-b03237700d49/where_to_learn_wing_chun_near_me.pdf
    • http://fabovodowep.epizy.com/65949001626.pdf
    • https://uploads.strikinglycdn.com/files/d5580306-d3e5-4a61-801a-c8a3afe70eec/online_arbitrage_betting_software.pdf
    • https://uploads.strikinglycdn.com/files/ab765388-8734-44da-b973-9b6b2e3b7375/sodagom.pdf
    • http://povuputuk.epizy.com/certificate_of_employment_sample_format.pdf
    • https://uploads.strikinglycdn.com/files/57405e66-7fcf-425c-83f7-fcef4d8562fd/66291457526.pdf
    • http://durunorutap.epizy.com/11231529225.pdf
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_3c11ad824eb74f92a577442749c4394b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/114e9591-e393-46cf-b685-6dbdf88dc3f6/add_watermark_text_to_using_itextsharp_c.pdf
    • https://uploads.strikinglycdn.com/files/605567f6-d4d4-4a77-8933-89c34fc2d1d3/amoeba_sisters_photosynthesis_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/abcfbd50-6395-4eb7-a149-257de60770c9/58248792386.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001400c.bin
7a4605a943b064adc24422752eaebcb943378d1f17c6ba8fa6d7982fe421ac46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 5336 bytes
font_01_sfnt_off00015211.bin
47c5a7ed3dc37f10f831fbdead92855ebd68583a41b62ae657d103bd7ea28cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15211 16616 bytes
font_02_sfnt_off0001868a.bin
5174569386ae30228fcb5fd9cae4c193e5dcfd7c5fe60f81002f77aa1bb34818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1868A 16428 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.