Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c8ff9704633094…

MALICIOUS

PDF

78.4 KB Created: 2020-12-03 14:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34916436681348722119c8631ae1b4d9 SHA-1: c39d5aa742fe6c0b32f73b561c4c190d9b49a110 SHA-256: d5c8ff97046330944f383c764c1403ec2eedafbffc3e4fe3fa4739e6c1b97c18
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external PDF links also points to a link farm, likely used to distribute further malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ggtraff.ru/123?utm_term=bye+bye+redness+correcting+cream In PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/b86de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5f9a95372dc8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_5fbaa9db695af.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/pejez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f8cc85f3126a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f8d869f9b67c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_5fad4c6b2b340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1c644b-d6ae-40f1-99c6-8a33a02ca2b1/mario.exe_rom_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72c9207-50d6-45f8-a1e5-ba87bd0c49ed/2705758799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5d83d6-3b66-4157-8163-caa80fb68a32/autosomal_pedigree_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d0eec2-037f-4500-8870-86d2c067a9ce/rodriguez_research_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecfbc65-d074-4fa0-a78f-7243a5e8a77b/pitisofud.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f1dfe9fc3622d5225d5f/t/5fc1c726fa04221c716155bd/1606534952351/el_libro_de_enoc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c5d5a3-f836-4e1e-8cbd-6a9b8a51c2ad/38158045828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5330e48f-3d01-423e-b40e-37d56a37a7a1/network_engineer_l1_l2_l3.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 5516 bytes
SHA-256: 9e91aa3b66fadf02a0742ec391fd98e752c6429aed094357b7d656ccba0289d3
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 11612 bytes
SHA-256: 1a3fffadb6be927bffdf48cdfd06d4c6e502fc0a6869867f9bc1387ae3b7400c
font_02_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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