Malicious PDF — malware analysis report

Static analysis result for SHA-256 816fd21a361a3837…

MALICIOUS

PDF

65.1 KB Created: 2020-12-20 07:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4a5ea1b3d901fa76c0ebb695794fc8cd SHA-1: 9a5556b5de5fb287c34ace44b19b2eb79f9e5226 SHA-256: 816fd21a361a383732fb09f9cd9591eade753e88bb020d20eac774b6049a5250
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a critical heuristic firing for a PDF redirector link pointing to `https://gettraff.ru/aws?utm_term=cannot+capture+screenshot+android`, which is a known malicious infrastructure. The document body appears to be heavily obfuscated or corrupted, preventing analysis of its specific content, but the presence of the malicious URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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.
  • 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/aws?utm_term=cannot+capture+screenshot+android In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5fb754150d8d2.pdfIn PDF document text
    • https://pujuferot.weebly.com/uploads/1/3/4/6/134657525/9f4178f2.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/5fc1559bc6d9645836252c59/t/5fc2af0cfa04221c7177c868/1606594317534/30071433399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dafc03a-5818-4834-9578-74d7fd9889ac/the_great_commission_mark_kjv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc117e49955c744b53cb0dd/t/5fc7c62266d87000d3bc3163/1606927906712/nuke_em_all_ark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfd4a10-cbde-4b9e-86bc-cace3fdbe4d3/budismo_moderno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9084eb-c4e9-42d8-b943-07fb359a5b88/watch_joker_free_hd_online.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/common_medieval_names_for_men.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_off0000c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 5036 bytes
SHA-256: 6c4b7bfb42066c52fb87817fb282ed44384942d79fc6d6f2c340804a53db81f3
font_01_sfnt_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 10616 bytes
SHA-256: a5a3b69aa25047e91416cc085ba59bfc1fc3eb68bd5395747e2cf97c31d08b35

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