Malicious PDF — malware analysis report

Static analysis result for SHA-256 4576776dfc2ced93…

MALICIOUS

PDF

102.9 KB Created: 2021-03-25 15:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53302409a8ff54097bb59efa1dac13f5 SHA-1: 18d09439cf50fe708751b3ce576857eca6bba9c9 SHA-256: 4576776dfc2ced930344cf8060e05a750330b1bd9d1c1301554bccaea30ab69e
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 PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://dafemum.ru/strik?utm_term=why+is+it+called+tropic+of+cancer+and+capricorn', is suspicious and likely leads to a phishing or scam page. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://dafemum.ru/strik?utm_term=why+is+it+called+tropic+of+cancer+and+capricorn
    • https://cdn-cms.f-static.net/uploads/4366009/normal_6014207fc84df.pdf
    • https://cdn-cms.f-static.net/uploads/4464542/normal_60554953e9eaa.pdf
    • https://cdn-cms.f-static.net/uploads/4475734/normal_602d252923b31.pdf
    • https://cdn.sqhk.co/bubiwalifeda/ea2ghjj/velizilorezirivuvekal.pdf
    • http://fazurusitu.getenjoyment.net/joy_luck_club_a_pair_of_tickets_summary.pdf
    • https://static.s123-cdn-static.com/uploads/4472506/normal_600019084c68c.pdf
    • https://cdn.sqhk.co/wufotubi/jjAC0dr/jumia_black_friday_phone_price_list_uganda.pdf
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5ff6919b51573.pdf
    • http://keruluzo.medianewsonline.com/free_converter_to_word_software_download.pdf
    • http://puduvab.sportsontheweb.net/types_of_anemia_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_fa9ac1fd39b14c559c5b9513b42bc4f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7207e818-d4eb-4add-9ce3-73b62c1a9278/sajav.pdf
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_ba0415864e9f4ee789c83b54777119b3.pdf?index=true
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_e880a664e14245179b0706ba10fe17a2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1a16c06-631f-494d-9a70-a3b017a4d7b9/bissell_crosswave_pet_pro_multi-surface_2306a.pdf
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_0756dcef76a84ef98c62c0bd9993a414.pdf?index=true
    • https://uploads.strikinglycdn.com/files/64835240-c683-451e-aa2e-16b87acfe50b/how_much_does_it_cost_to_send_mail_internationally.pdf
    • https://uploads.strikinglycdn.com/files/fa67771d-65ab-4d55-b94c-1b0911271a56/53956594291.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_4d9da28352e549b9a3c5bf4a45188383.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eee13b49-0a37-42a6-b7f7-9bfa49eb653e/is_breaking_bad_movie_on_canadian_netflix.pdf
    • https://uploads.strikinglycdn.com/files/a48d0b27-98d2-44a2-8bec-ce07c378e515/49010649541.pdf
    • https://uploads.strikinglycdn.com/files/e0a1d990-c41a-436b-ba20-fe4f2ea72dc2/color_constancy_psychology_definition_example.pdf
    • https://uploads.strikinglycdn.com/files/0cb5a8ca-74ba-466c-b86e-52087f7f1761/worululo.pdf
    • http://wemaxoseni.myartsonline.com/59312895533.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_off0001469c.bin
ce3198184428930a3bd9ed335f72f2f0c1a6581c33813bd35881377430871f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1469C 5360 bytes
font_01_sfnt_off000158e3.bin
394155d92f236cf82250f5b2f560c6fb15fa99ac096dfd947fff6f891795c8c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158E3 16196 bytes

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