Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db5826ecf447628…

MALICIOUS

PDF

97.7 KB Created: 2020-11-09 20:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 032baa2fe5063d91bbbd5a140faf4d88 SHA-1: 255be9ff4019633f8b8c8a04a22879b44f08aaa8 SHA-256: 4db5826ecf447628be110e9be2a6f24894b87c62e7da3340c196f758adc175d8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the nature of the link farm point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/strik?keyword=undertale+dialog+box+generator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8ca25ab92d2.pdfIn PDF document text
    • https://gemefakopegixi.weebly.com/uploads/1/3/4/3/134309359/vikiwusuvopadu-xipitukodife-wevasoregibafex.pdfIn PDF document text
    • https://galuxenezinex.weebly.com/uploads/1/3/4/4/134437763/187506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5f8cbb3e61668.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/7989093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f9427cf24cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_5fa6cd01e0592.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/tivabumezisazurone.pdfIn PDF document text
    • https://wovikuzejujitij.weebly.com/uploads/1/3/4/5/134506660/tenopomo.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/ratuzoruked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_5fa4d8c672a13.pdfIn PDF document text
    • https://gufavugowiguxu.weebly.com/uploads/1/3/4/5/134590320/75971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zamuriza/kayla_bikini_body_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/fowaxevopibal.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/27768097771.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14043 5012 bytes
SHA-256: d9071841be4f571c08bc1604ea99c55783c7e0fe5a8e3926d66e86db530c078e
font_01_sfnt_off0001515f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515F 12656 bytes
SHA-256: aa36690fa2b4e3d8222d7a2e13c8df7c322603abc2e46b48071f5f20a8e98a8f

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