Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1543153eef9b83…

MALICIOUS

PDF

58.7 KB Created: 2020-11-27 20:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 98bb64afbea940039ae8f95aca07645f SHA-1: b9a57b01b546e16972df101c8db9be4fd5f0f32c SHA-256: 0c1543153eef9b835caa29c5db9b37ee553bccee80f07ff0707aa9263312b533
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=hindi+alphabet+learning+book+pdf PDF link annotation
    • https://zotolujirerezo.weebly.com/uploads/1/3/4/5/134582396/fopivube-fasisaworawe-deseserojoguna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5fa87f1b7e9a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5f9d7b8d759fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_5fabf0b32a84d.pdfIn PDF document text
    • https://jelifamije.weebly.com/uploads/1/3/4/3/134320618/513871.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/ruvakimodara.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/zedutedunivopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_5faa79dd40bc2.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/sukobogixe/mogevadutufogew.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/mexico_accent_on_e.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/savesilerex.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_off0000a959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA959 5292 bytes
SHA-256: 57e4a41471358f239a10a76ab0e36809aa392cda97e345278786ef7eb1538fb1
font_01_sfnt_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 10236 bytes
SHA-256: 17d767a3c319903c036b64c890ca5f78c03e094a56dcd327a3c6ecf194d0932d