Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f593098047e6380…

MALICIOUS

PDF

69.5 KB Created: 2021-02-04 08:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 76ed285ef552425e650b1d5239a7d121 SHA-1: dde297429186c709a5e344dadc0ec5b0f285a883 SHA-256: 8f593098047e63807b81d2f2a1e0391419dcab43c406bf456966531bb0d8c477
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=bollywood+movies++utorrent PDF link annotation
    • https://cdn.sqhk.co/lojumisebu/hjgIjhQ/war_and_order_apple_game_center.pdfIn PDF document text
    • https://ronudinogem.weebly.com/uploads/1/3/1/3/131398573/lesujavupotiwiduxemo.pdfIn PDF document text
    • https://cdn.sqhk.co/voduzetefir/jatsq6c/linear_function_formula_graph.pdfIn PDF document text
    • https://zuwositoxo.weebly.com/uploads/1/3/5/3/135315809/pamumopusuwir.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/gFjhiaw/jilivuzimoti.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/440046.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/sggqcJs/61142410105.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/4cd551.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/Oha1gjj/ruzatukubavavukejogiruwap.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/c3f3d40.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/6ejvhfF/zopofosufomugisivofikek.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/hchcgcW/biwaritelogomowa.pdfIn PDF document text
    • https://regifedemez.weebly.com/uploads/1/3/1/4/131406591/38074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tawatibajat.rf.gd/85396369370.pdfIn PDF document text
    • http://zajobape.epizy.com/97282040862.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_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 5064 bytes
SHA-256: 407b9ca30033a664fb50ed51c0d51dfb453482b3b6e2621f61e5cd4c227f2806
font_01_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 10288 bytes
SHA-256: 9ad8289360f1011a16e8081e5d0a8d28ec0fbd8b899a9046fb8e0762a873224c

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