Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fa6cef82f92836…

MALICIOUS

PDF

94.1 KB Created: 2021-04-05 11:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7ad0cbd4ba8653bd74d3b0fe6ff8f57b SHA-1: cd8abf26221fc850ee5c253e858a536d7bb751c0 SHA-256: 35fa6cef82f9283671d2c4abab4af7885e9320ebda73350e9c4b11e1a6de7517
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. It contains numerous external links, with the primary malicious URL being https://midufefew.ru/award?keyword=free+download+spoken+english+book+tamil+pdf. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a site hosting further malicious content or unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=free+download+spoken+english+book+tamil+pdf PDF link annotation
    • http://100naturals.fun/football_game_2019_for_pcbwzqv.pdfIn PDF document text
    • https://dimulawi.weebly.com/uploads/1/3/4/3/134380670/4729811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370074/normal_5fc8637a00bd9.pdfIn PDF document text
    • http://bestsaleshopin.xyz/72314376337x67zq.pdfIn PDF document text
    • https://nalirukixew.weebly.com/uploads/1/3/0/9/130969663/1057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_606031504b409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5fddf4a223ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451045/normal_5fcb740b88cd7.pdfIn PDF document text
    • http://erogan24.website/particulars_of_claim_template_breach_of_contracterjym.pdfIn PDF document text
    • http://tojiritukimafom.iblogger.org/sharp_microwave_oven_service_centre_in_bangalore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/814a838a-bc58-4fc2-bb3e-dd3f8c248f1e/scientist_that_studies_motion_forces_and_energy_is_called.pdfIn PDF document text
    • http://rerorexemebiliv.epizy.com/pupoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/448ae6e8-d1a5-4c57-974a-bb8f082ad5cd/vuverin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf68906-91c8-4056-8dd5-d6e5a5f26823/1291358002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc3161b-9902-422b-80fe-619e1311a6db/halo_bassinest_swivel_sleeper_essentia_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46984f57-2c6f-4f9f-8462-6cdc9e1b5d4f/13177477675.pdfIn PDF document text
    • http://jokiperone.epizy.com/how_to_format_sd_card_canon_c100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf0bd79-bc76-46f4-96d8-ee8caa59865e/the_trial_kafka_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e818c31-3a62-42b6-9ff2-52a99fc96eaf/how_to_become_a_minister_in_texas.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5704 bytes
SHA-256: 2bec1d06efaacf2bb5d4541d97d9ec9a95d8772130de34896717c00717a81d92
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 8808 bytes
SHA-256: 66e2447daa251067b694119bece6aaa1a7e9254cc358d33e0cd5431635d17134
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_03_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 12184 bytes
SHA-256: 8bb783cbdc35150c0f930e300c50110daa7f62ba3abbca87906d56fb8f9fb38b
font_04_sfnt_off000151e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E6 6568 bytes
SHA-256: 9388e1ca36d2d81bbed0e4796405978109a79fb313c04b3b73d73dfd3decc272

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