Malicious PDF — malware analysis report

Static analysis result for SHA-256 889ca4cb797c1b5d…

MALICIOUS

PDF

74.7 KB Created: 2021-01-09 12:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d6a6276d145ad8d7ef1e7ec8127a6552 SHA-1: 9d321dd9e527303e27656a15dc5ec9cb5d253324 SHA-256: 889ca4cb797c1b5d9abf7ac718c5399bef99fcd9701fd97c48f8c688c304f15b
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure and a link farm, directing users to external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'Blackboard mdc login', reinforcing the phishing pretext. The presence of numerous external links, including one to 'trafffe.ru', indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/wb?keyword=blackboard%20mdc%20login PDF link annotation
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/jubaxebekoza.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/icBieha/bad_roads_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/bUnihjg/91057324565.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/SYgjYha/top_marketing_companies_in_atlanta.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
    • https://s3.amazonaws.com/fizufapu/raler.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/fewopadumezatadudorupus.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/begefuvuvigewenetabofikun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0e7e89-69be-4997-a215-0d77263b99ce/sujet_d_argumentation_3me_corrig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ae7664-465d-4894-be47-3d788f203d3a/frye_campus_boots_black.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/rodafax.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/addition_and_subtraction_worksheets_free_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/ge_cafe_refrigerator_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa11f2e4-e67c-4310-b413-b4d9b20155aa/actividades_para_preescolar_16_de_septiembre.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/jajowedufosusamapepawuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a724b3-d19b-4e72-92fc-df0d2d938f65/sizoxexoz.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 4924 bytes
SHA-256: c6f54254d4740a76b826071fcb47997a63c2399f1269d885d6a9b7380faabf28
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 11784 bytes
SHA-256: 656f5433232c363777bb591d5e5f4e7810a67d7bba1431c1e85043cd97bfff74
font_02_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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