Malicious PDF — malware analysis report

Static analysis result for SHA-256 697ef3146789b384…

MALICIOUS

PDF

75.7 KB Created: 2021-02-17 15:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 526719a19fa61f93e9b0bec67b8040cb SHA-1: f9e9885009f0979004945883eca4ca0b8c28b05a SHA-256: 697ef3146789b3842ee2ae19825a412e7781e3026e7b9b045271df763bb39052
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The presence of embedded URLs and the overall structure point towards an attempt to redirect the user to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=guided+reading+activity+21-1+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fcbaa8180e47.pdfIn PDF document text
    • https://jawifeguviweti.weebly.com/uploads/1/3/2/3/132302916/6591190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6021f9d7a77c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_6008b06b05103.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/how_do_you_fix_a_garage_door_opener_that_wont_stay_closedf871t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fe564ddb709c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5fc8e29d1b95b.pdfIn PDF document text
    • http://vvd.bar/receptive_and_productive_language_skillsa2h3l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5fcfb458bcdc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5fe92c114c676.pdfIn PDF document text
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/nopovo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5ff6732532ccf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fdd9dbd42e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_6025674b6d066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5fdb3fdf01c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376878/normal_600916326b175.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/vuraradaso/brule_river_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/reforma_de_casa_antigua_precio.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_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5640 bytes
SHA-256: 7aa107a87aa76e57c101908a8450d40f579c88bf9243a3e8cf5fbe82801ef872
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10820 bytes
SHA-256: b6ef42a8f39e133a2c96a6337eff848c9a2e732e5c12146ebd607337a68edaba

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