Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d5dbc7b878a035…

MALICIOUS

PDF

66.5 KB Created: 2020-12-15 20:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 198f4635a9f518bd9ee459ebf8b72279 SHA-1: e07af1edae0d53c97ce73488dc5f7706701b0ffd SHA-256: 37d5dbc7b878a0357754b95a0d6ea7c80c4b7795b5c5b4e15c855a375d6e9e53
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The presence of a PDF_URI heuristic pointing to 'trafffe.ru' and a 'SE_DOWNLOAD_BUTTON' heuristic suggests a phishing or malware distribution lure. The embedded URL is the primary indicator of malicious intent, likely leading to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=applied+hydrogeology+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fa6d2f32a092.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fcd29eae5af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fb2e6a1598af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f8d4afea9a00.pdfIn PDF document text
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/5920702.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/nuxulikiwab/83934156841.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce6cf0c965c74ca3dfdf93/t/5fd64e3bc4373837b9084c46/1607880252541/bcom_tm_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/14225400924.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2fd6b97992eb55c026f/t/5fc1f0b43485235c860c6bea/1606545589164/rich_dad_poor_dad_book_in_hindi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc787120d716e027b048861/t/5fc7fea92b9a13131277292b/1606942378810/pukorojetamodepapuwote.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/97551944670.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_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 5308 bytes
SHA-256: f44e2054f44feef634d86172a568c17ccb54d2bf00b88656aa5b701c2b16e701
font_01_sfnt_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 10964 bytes
SHA-256: f868f3ddccb3c3533dfbd95eda8674ccc8b689e52f8714382ced86a192a236a1

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