Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c36d15e302961a…

MALICIOUS

PDF

78.0 KB Created: 2020-11-24 06:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 068693c834788c91573cd561e7c6aeb9 SHA-1: f1e13a59b34bc5b00fa9465a33b6085f7b60ed71 SHA-256: a8c36d15e302961a30571481a2cea2d18fc3c19204c637d190d698c38a22203d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One of the embedded URLs, 'https://cctraff.ru/123?utm_term=all+that%2527s+solid+melts+into+air+pdf', is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

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://cctraff.ru/123?utm_term=all+that%2527s+solid+melts+into+air+pdf In PDF document text
    • https://jaxazinozusepir.weebly.com/uploads/1/3/4/2/134235406/simotufuzobuviwu.pdfIn PDF document text
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/fenomojiruz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fa202d712549.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/jaxakupenasifitexuw.pdfIn PDF document text
    • https://tilawebaxipas.weebly.com/uploads/1/3/4/5/134576196/dalowor.pdfIn PDF document text
    • https://katidifivova.weebly.com/uploads/1/3/4/7/134715674/24fc534085.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/5158249.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/towafuvuzuvawa.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/5b8bf3948c1e.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/guloxabijixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d862bc60-cfaf-48f8-b1c0-90490fc1f5a7/x22_super_pocket_bike_125cc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c46fe53-3fad-4990-a8ac-b0f9c40d3cc9/pedizomemejadukinetoletu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6162fc84-6598-4b4b-9b76-f2edc4da86f7/evaluacion_de_impacto_ambiental_garmendia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1634411-7cb7-496b-9720-4af607ca0412/manifest_destiny_painting_analysis_answers.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_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 5304 bytes
SHA-256: 88b11940c15d2568ad45bf168cb4e7588693da3bb1fd6a338400d22d65485283
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 10684 bytes
SHA-256: f2eb51b54305b0a80d7d7cb998711ee45c699dab14d6f03206f97f8cb6af769a

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