Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae2acb0c3cf00b1…

MALICIOUS

PDF

80.5 KB Created: 2021-02-25 01:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 645343cbab17a3285dbca29b3efbbdb0 SHA-1: 4b510f9df6213ed4c8e9e1328773560341a5c2ce SHA-256: 1ae2acb0c3cf00b1e9fe5f99af84c04f5733d8f279daf4298e601aca5240a47e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to distribute malicious content or phish users. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=sheriff+of+nottingham+disney+voice In PDF document text
    • http://lavumosilewu.22web.org/visirebuximewoxodido.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/94423946866.pdfIn PDF document text
    • http://joxorapux.22web.org/bosch_serie_4_instruction_manual.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/xofomijuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_5fd92f2087543.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/electronic_catholic_bible_free.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/how_to_use_a_nextbook_tablet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_600afc875af32.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/does_dollar_general_pay_holiday_pay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460233/normal_5fd837a252275.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/17552727337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_5fca6c6bdf6c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_60318b897b6c8.pdfIn PDF document text
    • https://tivositazevuzin.weebly.com/uploads/1/3/5/3/135349871/5922969.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://zemadepa.rf.gd/certificate_of_conformity_template_australia.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_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 5456 bytes
SHA-256: bff7b264b123e1c8f7eeccb9fb2ea9dd9c4c3b5efb64846882a2793d03dedf4e
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10296 bytes
SHA-256: a27ca6b9fa635ddd2b2383cb3a99b3a008ccbae1fc55dcf062aff76cce27499d
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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