Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ffd64e8983b57d…

MALICIOUS

PDF

73.2 KB Created: 2020-12-07 15:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9da0f005f6fbd96f2427d0090793d7cd SHA-1: b9dee041435cd3d88a13fe250a89a917d7be14ed SHA-256: b3ffd64e8983b57dd41a1ef27ce7cb4826d9636210678fc65c190a846c1d4068
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. Several of these links point to potentially malicious domains, and ClamAV detected it as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or phishing sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=code+generation+template+simulink PDF link annotation
    • https://jadigitunuw.weebly.com/uploads/1/3/4/6/134672933/24fea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_5fb7ffdbd3518.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/9445829.pdfIn PDF document text
    • https://garusase.weebly.com/uploads/1/3/4/6/134634063/1351934.pdfIn PDF document text
    • https://guvavibigedufos.weebly.com/uploads/1/3/4/8/134855984/fumexolowufala.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://uploads.strikinglycdn.com/files/9942c346-c062-4f91-9f7d-d5c65c9688fb/snow_cut_bridge_wilmington_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a455a41d-cb10-434c-a444-e84877b53262/3417013136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c819fe-736b-40a1-acc4-ad6428290150/s_corporation_operating_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b5e921-c2af-4a68-9c14-6e654302bbca/budafetipe.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/kaxinores.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 3196 bytes
SHA-256: 7c63ecc69363cab1dd50356bce79934f125fb1a455d3c3ef5b26a70abbd49d6e
font_01_sfnt_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 5248 bytes
SHA-256: faca3a99b329bf62c1da9959ff61283cb62b1e2e3c4b7249f48787cde8da2ed9
font_02_sfnt_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 11000 bytes
SHA-256: 50e679c3e9a1d5cd63e6794bbbedea67895b0dcba565ebb8e677345627b0c26d
font_03_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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