Malicious PDF — malware analysis report

Static analysis result for SHA-256 815727d5ca999fab…

MALICIOUS

PDF

68.7 KB Created: 2021-01-04 06:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 62859aa775a9740ac48082d41fa78c7e SHA-1: 61227715364cff962fc1ad30e4c6c99055e1efdb SHA-256: 815727d5ca999fabc1c8cd2f422df02db47ca071b6beafe77eda88f6ddeb8baa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Helen Keller worksheets for 3rd grade', likely a lure to entice users to click on the embedded links.

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
  • 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://traffine.ru/123?utm_term=helen+keller+worksheets+for+3rd+grade PDF link annotation
    • https://cdn.sqhk.co/sovokeduseb/fhbQDjg/wilunezebofigozemip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5feba541a931a.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/jbhhmql/street_beat_customs_jeep_cherokee_sunroof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fb9788f7bdd9.pdfIn PDF document text
    • https://bafupenog.weebly.com/uploads/1/3/4/1/134131575/pobujawisuvep_vorufaxu_mivediwizezow_kenati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5fd0659b1ddf4.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ggyqpAe/50620327146.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5feb5f6cde391.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/h1X3shh/risil.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/joxatuzoxe_patinebajovote_kamis_zunewutenide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8109d7-c77b-4b5c-a541-4c6df1fbb600/xasarufazepet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d9fd74-42da-4af5-b7ea-1c5dbe0c6b4e/the_big_bang_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a18f98fd-ffcd-4fae-a219-a60631371ce4/sarracino_middle_school.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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 5448 bytes
SHA-256: f3a2312e3b10878ff3e987fbf86eed1f9651dff7ded7838aba1b06330849e042
font_01_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10984 bytes
SHA-256: c278fe7929f7f353682f7ebb2fb91c109266561f5dae278b26a6c13694cd3da7

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