Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e9593c51a742aa…

MALICIOUS

PDF

68.5 KB Created: 2021-01-08 09:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 51e92d42c9b098e309c222cd36215e51 SHA-1: 71d4cd7b4dd8f129f2204788ffd6ad9198a98ba9 SHA-256: d3e9593c51a742aa1ce6df6fe7b49390bbca23e4de3d2a7ce5720c5415eb629f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external websites and are identified as part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=cornell+university+library+guides`. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/aws?utm_term=cornell+university+library+guides In PDF document text
    • https://static.s123-cdn-static.com/uploads/4375525/normal_5fc825f6920fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_5fda6cce21952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_5fe64b623bc10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5faeda483fa98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_5f94863ac8f51.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/likukilej-megomed-sizujem.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
    • https://s3.amazonaws.com/jumedemimo/write_a_letter_win_a_house_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/bowatoximib.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/49904260623.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/ag_center_cattle_market_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/national_anthem_song_free_india.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/allahabad_kondapuram_audio_songs_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/64923790878.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/dobalim.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_off0000c239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC239 5200 bytes
SHA-256: e2be6d524d505a25a5bdf6f648cfa1b227ebbea3e27b41191833101f8b28fe0f
font_01_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 10196 bytes
SHA-256: be4c4348d662a771bf84d753f25f9175de9db1cc9834287b4949915c9351e9c1
font_02_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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