Malicious PDF — malware analysis report

Static analysis result for SHA-256 61903726f3f658d1…

MALICIOUS

PDF

69.3 KB Created: 2020-11-26 23:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e6ea5fba941a5566d965e2f664637f54 SHA-1: 3b5cb2312e14927df83932f523757531825f2607 SHA-256: 61903726f3f658d173d3e5b14f68cc5c18f2819dc3e350c13be779cd6e533fc3
222 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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
  • 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://ggtraff.ru/aws?utm_term=monthly+budget+sheet+printable In PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/7611010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f9a081b0ec20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5f9603c230d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f8fd5b1f2916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5fbb307e1e814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5f996d9ebeb79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/indestructo_tank_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6737a04-856e-425f-8d76-789a5a920854/50654551641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428dfdee-b37a-4a52-900b-95a6a839bb13/fuxunalezedulokow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0dbecc1-ec53-43da-ab5a-b8c733763cd6/xeseliluwerawubeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71316788-a27a-4f4e-b23e-14a828afa7ff/diwenodipagaxaziwunuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce9b69c-0f62-4144-a455-d81cad1d48f9/pipibidab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daff0581-e914-4fa1-802f-ff884c4f088e/91300787994.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_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 5468 bytes
SHA-256: d51afe310b49cc40f325f33869d8fa712d2c6a17bbe5ba4ac1461a1fb7d635a2
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10472 bytes
SHA-256: 3e24783847936575595e6f25486d481baa1dbea0244ff3bedeb43fc747e44849

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