Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6fca22dbf2ff0d…

MALICIOUS

PDF

74.5 KB Created: 2021-03-08 12:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: db674351ffdc87be3f1c52ceb9097ab3 SHA-1: 6a3e08450fcc1319229caf6fa1b6caa17fecae4c SHA-256: 1b6fca22dbf2ff0d2a955a6edbb6be07180cef8cb13fbcfdd07af05c8921cc63
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links hosted on disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the primary goal is to distribute further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=are+temple+touch+thermometers+accurate+for+adults PDF link annotation
    • http://snegny.com/jopezesofu1b4c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5ff887ccef341.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/4c38726180072.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/h5eOgjZ/58454913906.pdfIn PDF document text
    • http://fajiragudabega.iblogger.org/40922372595.pdfIn PDF document text
    • http://tijatanilipe.iblogger.org/fekixazikunasurixewopog.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/6064cb0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_601786281f42e.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/fukoviju_zonune_najutunegopepop_sarux.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/gjahdhe/43752937839.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gjhhijf/73766678452.pdfIn PDF document text
    • https://jutulomivepira.weebly.com/uploads/1/3/4/7/134775876/jurejirenozeju.pdfIn PDF document text
    • http://cg-designer.xyz/nebokuxomu3oykx.pdfIn PDF document text
    • https://sebigazawipad.weebly.com/uploads/1/3/0/8/130814057/vizonenevo.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/6726798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_6008b4672a909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_6036b01ea09bc.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/nigasimu.pdfIn PDF document text
    • http://letekidela.iblogger.org/apowermirror_for_pc_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 5384 bytes
SHA-256: e4f63b75864c4e1dcd6587b3def31906d04733fb54f3ab88487e75c9f842f95b
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 10788 bytes
SHA-256: e0f6cc93e70df619e094971d87d9b86fd5ad5c019cdfc9354b8b8291fe71f860

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