Malicious PDF — malware analysis report

Static analysis result for SHA-256 c973e3442a9fa722…

MALICIOUS

PDF

78.7 KB Created: 2021-04-28 09:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 75bb6b01243712c74e9f3d06fe16adc8 SHA-1: 6c2fd001ada72d8adc37f1298d9a847412692ade SHA-256: c973e3442a9fa7229b880ffe075e2e01f0cfea339d808cb79e0e3ea5bef6a14c
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/strik?utm_term=whirlpool+tub+parts+near+me'. Additionally, it features a PDF link farm with numerous external links, many of which are likely part of a SEO manipulation scheme. The ClamAV detection and ML classifier further support the malicious nature of this file, indicating it's likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/strik?utm_term=whirlpool+tub+parts+near+me In PDF document text
    • http://afterdealer.pro/how_much_is_the_cheapest_polaroid_camerajedc4.pdfIn PDF document text
    • http://reduslim-ordina.site/prozac_nation_librocz6j5.pdfIn PDF document text
    • https://kupejuzog.weebly.com/uploads/1/3/1/6/131637034/rubirikowan.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/momid-xafamapejobux-bimuderi-sugov.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/15812973497lkp49.pdfIn PDF document text
    • https://viremekim.weebly.com/uploads/1/3/1/4/131407965/5070895.pdfIn PDF document text
    • http://love-cosmetics.shop/aviation_logbook_excel_templatessv0pj.pdfIn PDF document text
    • http://construt.site/best_assault_mechs_battletechzxr47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/electronics_books_in_hindi_free_download.pdfIn PDF document text
    • http://tejoratu.epizy.com/social_media_marketing_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/29601499098.pdfIn PDF document text
    • http://kobomuxowujuvap.epizy.com/amadeus_basic_entries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284b0bec-e959-4be7-b50c-e4ac79192dc1/how_to_make_a_homemade_bean_bag_toss_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2e9e6f-0a40-44a2-8723-b2451b0b45db/xaravejilexikepurinunidu.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/sujibojelafomajurufe.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/advanced_excel_course_fees_in_pune.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/joomla_premium_business_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/nabijulufi.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/sql_server_index_insert_performance.pdfIn PDF document text
    • http://mevonaku.rf.gd/71027788479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfe02cd-1e4a-4ac4-92f8-c170e840f572/79416805972.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 5212 bytes
SHA-256: 488587ba95da6d86722265135382efab61ba95dc9b480177ffd4fcabb28188ff
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 11132 bytes
SHA-256: 2f4621e1488e081af4c7f9cc2de49da105dfabcd05fcaf2d3142ce4403457207

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