Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd627d2d465e626…

MALICIOUS

PDF

80.7 KB Created: 2021-02-26 20:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e308c7772806cb446f6d15898c1ab2a1 SHA-1: 2412af13981b2c5b692db1b008149c57ffc53fdd SHA-256: 3fd627d2d465e6263068b265b52e497e37bcee47c57d0ec3351e6ca2f2c296c3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, suggests a 'security analysis' theme, likely a lure. The presence of multiple external URLs, including those hosted on Weebly and custom domains, indicates a phishing or content-scraping attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious intent.

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
  • 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.
  • 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://golowaki.ru/aws?utm_term=security+analysis+2nd+edition PDF link annotation
    • http://wejowadizabudex.mypressonline.com/graco_pack_and_play_sheet_size.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/4578718.pdfIn PDF document text
    • https://sanituwinera.weebly.com/uploads/1/3/1/3/131379206/101a61bdc303b6f.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/jofatijiwurekibel.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/graphic_design_portfolio_template_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_6018dd333b24f.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/how_to_set_up_home_theater_with_projector.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393635/normal_5fcdc381a4c4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_602358e11fedf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_5ff94f8fa6461.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/xididezifijuvasamiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_601542b78c677.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/luborinizu/cd_audio_track_format.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/idsa_guidelines_candidiasis_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/academy_of_management_executive.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/73138348869.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_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 5152 bytes
SHA-256: 50c980efcdbd7d2ea33b9b589ba6e82bf383c168b27dbdd3e21560b6c56db972
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 11216 bytes
SHA-256: 0d0bc03ddc74f7de69cf30d9256d817619c6a9525f75d8f07fd461d52e81e84a
font_02_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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