Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1fd49b53e75f94…

MALICIOUS

PDF

70.1 KB Created: 2021-04-10 12:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 045b9f726fa6ff3662b69a1b2712148a SHA-1: 02fb75f07de1fa78901155ea481b46ac9aecab72 SHA-256: 2d1fd49b53e75f94708830cc347bed0c46d4d1e5d7af682f00aca17365bbb8f4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity rule indicating an image lure linking to an SEO redirector for free-download phishing. The ML classifier and ClamAV also identified it as malicious. The primary IOC is a URL that appears to be part of a phishing campaign, disguised by a UTM parameter.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/strik?utm_term=washington+dc+female+news+anchors PDF link annotation
    • http://sijixobepavip.22web.org/autocad_revit_mep_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_6043e61487d7d.pdfIn PDF document text
    • http://sanadewa.iblogger.org/93252232782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_5fd80d5b1de28.pdfIn PDF document text
    • http://fepekasizu.iblogger.org/minority_report_show_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_602d370c35477.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/wujanozo/34316941319.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_a40d048934fe4d0c8c8dc8165d85b290.pdf?index=trueIn PDF document text
    • http://nelibusanexiput.epizy.com/thank_you_for_the_quick_reply_email.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/remaravigasebukasa.pdfIn PDF document text
    • http://lojajute.rf.gd/risaleviv.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/trane_mitsubishi_mini_split_troubleshooting.pdfIn PDF document text
    • http://mupufuten.epizy.com/72519863106.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_d1fc77bd8f32403ab5758f8b9469e863.pdf?index=trueIn PDF document text
    • http://sibalunamiwiner.epizy.com/97249691855.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/sewetevimo.pdfIn PDF document text
    • http://demunoj.epizy.com/lease_agreement_example_template.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_3ff487c0a4914b008ea183b56ced2857.pdf?index=trueIn PDF document text
    • http://dexegesen.rf.gd/ipcc_report_summary_for_policymakers.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_34d254480c594229a68e221ea5442fe0.pdf?index=trueIn 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_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 5540 bytes
SHA-256: f3bb7202bf026773d1de168985409c756b2bdb0f8d391778b24ef7c66a806727
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 10860 bytes
SHA-256: 804d5add3457235ca36fad22d953f3bcb2b4bff4cca896c92e1acc29f04eea4d

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