Malicious PDF — malware analysis report

Static analysis result for SHA-256 767f7d5adcd889a6…

MALICIOUS

PDF

80.0 KB Created: 2021-06-10 21:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c930d4d47f008d341c59f0881a12f880 SHA-1: b41981bb8c116a12c42eb2a330adf19c13ab0054 SHA-256: 767f7d5adcd889a6f37a714557a4c8a0f1de76b5efbf063fe3754f7ea05e38d4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, including one pointing to 'medvor.ru' with a 'download 7 rings song' UTM term, suggesting a lure for potentially unwanted or malicious content. The presence of a large number of external links, many hosted on disposable domains, is characteristic of SEO poisoning or phishing campaigns designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://medvor.ru/pbw?utm_term=download+7+rings+song PDF link annotation
    • https://wipasokewuwil.weebly.com/uploads/1/3/4/0/134000036/fejiku-wefuteworarefi-weluki.pdfIn PDF document text
    • https://samugunu.weebly.com/uploads/1/3/4/7/134701516/kopuseginomeni-rubojujev.pdfIn PDF document text
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/zafutij-retuworexutas-kudunam-jadunin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tejudafo.pbworks.com/w/file/fetch/144820458/fewuxuji.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/twilight_full_movie_in_hindi_part_1_download_hd.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/f/how_to_make_in_little_alchemy_2_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ec8a09-6a86-4105-8c23-5bd6ea3e7e95/what_are_the_subjects_for_agriculture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75127c35-53fe-480f-bea1-b86567ab76d2/rifub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4149091c-739d-4d15-a211-a3e13150b409/is_glasses_usa_trustworthy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f299f76d-95af-4901-90ba-df2725d41de6/baduzilapiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa2b788-3312-459d-8864-147cbcebf228/tuxakadevadobito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4690aa98-3936-4d1e-b6c1-fde03b43bda5/plantronics_backbeat_go_410_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4d7cf8-2c57-495f-83d5-a26663ce97bd/32577650952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4cc3320-e111-4337-bde1-c83ff9990637/nejatalepijubusa.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/w/file/fetch/144475410/how_to_connect_nest_hello_doorbell_to_google_nest_hub.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/electrolysis_of_dilute_sulfuric_acid_using_platinum_electrodes.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144412797/logic_pro_x_trial_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2141f1af-4261-4617-88bb-33d078a40d3a/what_is_exploratory_research_with_example.pdfIn PDF document text
    • http://xumamiz.pbworks.com/f/what_are_the_8_types_of_adjectives.pdfIn PDF document text
    • http://dewepun.pbworks.com/w/file/fetch/144925728/92328061368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32c6a04-b225-4c96-be69-fa146e2f8e2e/toro_power_max_826_oe_oil_change.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/malayalam_full_movies_free_download_utorrent_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 4756 bytes
SHA-256: 660cff4f16a1054664c2971940645c2e9df925c6455e33bd6257affe58b57ae9
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 11384 bytes
SHA-256: 8505e2cac460b55f5f843d541e83f2b3f925e679a7b5cb88eb1186cc6faa0e3c
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c