Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ce027b6b22a810…

MALICIOUS

PDF

61.2 KB Created: 2020-12-15 09:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f31a79cf68c5087dc2a418405e0f28c SHA-1: 7fb9bbcd3ccbe9e2e1ea10c7eb4f4ac4624d3d14 SHA-256: 50ce027b6b22a810529360c697ed6234b21e91ecc257f7fad6572c32f043d471
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links, with critical heuristics indicating it leads to known malicious redirector infrastructure and a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gettraff.ru/123?utm_term=lesson+of+the+kaibab+deer In PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/6345263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_5fabc7e35ee0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489263/normal_5fc4a412cc9d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475383/normal_5fc55bb42b8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_5fbcd61509016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcf050de9f4503292f02a9f/t/5fd67aab491a58544a153e28/1607891628793/irssi_cheat_sheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc168c927a199023ab8f22b/t/5fc6e06a1d106d256bb2675f/1606869099056/super_water_slide_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/zewofatis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb79e5c7695ca99bb922/t/5fc0f61708845d0924aca977/1606481432568/should_this_dog_be_called_spot_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfc9fef3361272aec324a/1606220960641/jack_prelutsky_poem_my_neighbors_dog_is_purple.pdfIn PDF document text
    • https://s3.amazonaws.com/bikebuduvud/nouveau_riche_oblige_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/papa_louie_2_unblocked_77.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/19075311973.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/5_letter_words_that_start_with_ge.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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 5108 bytes
SHA-256: 37f81247eec4f67a923eb467cfd57157454f33edd7cec0de3b3988639578ac4b
font_01_sfnt_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 10356 bytes
SHA-256: 6971031cd7f06ff2aa68b3a2123d5dbaed1d0346354df13ff5b4bc2ff9a715b1

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