Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f899b3df8e1e47d…

MALICIOUS

PDF

87.9 KB Created: 2021-05-30 07:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f7ae7425dc13183581ccb2835d359312 SHA-1: da99180a64d4940283f3f977dc05c74680264d0d SHA-256: 3f899b3df8e1e47d936860835e3a5c20533ad905396fe58eebbfd5dfba1bc5a5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=maze+runner+1+full+movie+download+in+hindi+480p+filmywap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496853/normal_6046eb467360b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5fcb3f570c500.pdfIn PDF document text
    • https://limumowitizuwag.weebly.com/uploads/1/3/4/5/134587832/b58ba28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_6053b0e03d089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467004/normal_5fc648cd7901f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_60170116944a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_600bedabb720a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_6015cf5b30eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_604348805b52c.pdfIn PDF document text
    • https://jutonigozazizeg.weebly.com/uploads/1/3/4/7/134700746/gefudajelijami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5fd3aec929b04.pdfIn PDF document text
    • https://noduxexoretan.weebly.com/uploads/1/3/5/9/135993764/kaxesu.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/59e671ec-cb1a-4860-b112-6ca4946ae685/47894944463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/991fd7e3-a28d-4235-b669-1dc772657fe9/95188542769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0c70a1-1274-4a39-98c0-46335acb1333/power_acoustik_ptid-8920b_manual_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0a9a91-cc21-4826-b429-5d731221f8c0/a_history_of_western_music_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283dc980-5d1d-4bc7-bed8-195f476d22f8/525232478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0c37c3-abff-4b94-a281-16d639bbc6e7/derafikevarufere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fada3dd4-1fdc-4589-a35e-65a26696ae76/on_the_road_again_chords_canned_heat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fe5c38-aa74-4977-b453-38867578bd2f/59887237689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2141f1af-4261-4617-88bb-33d078a40d3a/what_is_exploratory_research_with_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b16807-6419-4859-966a-0ad8953958f3/how_to_buy_shares_market_index_futures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17480ad-23b9-4d77-9002-4fbd49a1b17e/wasagujit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9e9e17-c075-4789-89ba-90abb2b5015b/go_tell_it_on_the_mountain_hymn_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf259cb-f86e-4702-881b-44189bcdc25b/what_is_it_going_to_feel_like_outside_today.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_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 5888 bytes
SHA-256: d8931cc21170ea020109614c1e1123c23ab6241bb155a739311d79542f04c6ea
font_01_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 12124 bytes
SHA-256: 6c0e1063cd9e7eccf49685aa4295d658a7966d91a4b61896a7a4e26d1b31007e
font_02_sfnt_off00014380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14380 2752 bytes
SHA-256: 4731cd301a7a5a42cc4d29c767753cdd2741619edac511969d4641f506eef8ed