Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1d7b542d3fd9f…

MALICIOUS

PDF

92.5 KB Created: 2021-03-25 00:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6792e3f202c340bd04da88f86d8e0516 SHA-1: 140799cba2acb265da2c31dd20f6e9ee76d13fc1 SHA-256: 85c1d7b542d3fd9fcdf3618e4926c232f36974edb7dcf213383949333acc7178
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=what+does+a+stable+electron+configuration+mean PDF link annotation
    • https://xurozakewera.weebly.com/uploads/1/3/1/4/131414240/ff553a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_604458e3cd890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_6005af4e93b48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_600708e8b3edf.pdfIn PDF document text
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/6955834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_5ff22103ddc04.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/kajupiniximupuxiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_60532de23ac20.pdfIn PDF document text
    • https://wobakasufafe.weebly.com/uploads/1/3/2/6/132682589/32eb810aaf4.pdfIn PDF document text
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/wiwisexenerefix-xipasugij.pdfIn PDF document text
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/7294322.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
    • http://mulisebaxugivu.rf.gd/ruporidoxavodi.pdfIn PDF document text
    • http://pomadepoxe.epizy.com/greater_blue_eared_starling.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_54058bc9bfde4dd5941a36f9f55b0191.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/when_you_have_tried_your_best.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_d77b6b1163854dc1be0a1a4cb1cdaa0b.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_a185c697d81447a8813f0c3937ff5ae7.pdf?index=trueIn PDF document text
    • http://duguteterexu.epizy.com/fonakub.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_8de27506667747cb9999628b754523af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/easiest_bow_making_tutorial.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_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 5472 bytes
SHA-256: 4d5389ade5107cfe9e7a5f57578f268ff05c0da6a18cc854930742ebe393ae08
font_01_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 11460 bytes
SHA-256: 04992445acdb3126b7112a324e42eed91bb83c600cd8b16a82564c8c45bafafe
font_02_sfnt_off00015606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15606 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34