Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fd4ce53fd4fad3…

MALICIOUS

PDF

62.3 KB Created: 2020-11-11 06:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6742eccf621ce4dacd913a29e8431aa3 SHA-1: 234fa2e1a7178f6f1fb138dc5ebd357ed343adc4 SHA-256: 51fd4ce53fd4fad3c6c1c3d15eeaaf643ebceb8f60ba7ac8f990edac3d0b682b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF contains a large number of external links, many pointing to PDF files hosted on link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript or other exploit vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?keyword=luciano+restaurants+mass
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f91eff689305.pdf
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/debozazofume-wesalokat-wikujinujofisef-jexezipow.pdf
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/8582769.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f8731ba3d452.pdf
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/6594323.pdf
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fa485a98fdbc.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f89e47292a6d.pdf
    • https://cdn-cms.f-static.net/uploads/4409607/normal_5f9e259e66d01.pdf
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/lafelixopipama.pdf
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/reradiponiz.pdf
    • https://tasibitasu.weebly.com/uploads/1/3/4/5/134530233/sanupowosenedub_fugulolobexawog_wuluvupod_xixurajov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nafibanefexex/sett_framework_webinar.pdf
    • https://uploads.strikinglycdn.com/files/9d48a1ad-a00d-4531-b541-4dd890365654/5826982855.pdf
    • https://s3.amazonaws.com/xatojem/the_rock_and_fossil_record_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b912.bin
b44e8f8fbab43f0711ff98b312d82bd3425cfade2b128d144a1067fd3e7d70df
pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 4852 bytes
font_01_sfnt_off0000c981.bin
23f2768b1f463843dd9ecb356ae12c50cbf3e930d367356707e91817e5299f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 10500 bytes