Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34ec39652d172bb…

MALICIOUS

PDF

72.5 KB Created: 2021-03-02 14:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 617396c88f59b8e813f10504f50be41f SHA-1: ebd1ef4b9a6ce27044134604c8487a1bf775ee54 SHA-256: a34ec39652d172bb95c41bd2d3da143f90d6adffed6acd26a81a414f3f7dc72e
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links indicative of a link farm. The ML classifier also strongly indicated maliciousness. The embedded links, such as 'https://crophysi.ru/123?utm_term=how+to+get+your+cursor+back+on+a+toshiba+laptop', suggest a phishing or content-luring attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+get+your+cursor+back+on+a+toshiba+laptop In PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/fodiduvixokasaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_6023ea043cfbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_60207a619cbd7.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/Fgggesd/dupujir.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/apFjfTn/8445938145.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/1ucigfF/washable_cotton_face_masks_amazon_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444884/normal_600620436e10c.pdfIn PDF document text
    • http://ostanni.fun/lisakuvetukotaguwedopokibdp0c.pdfIn PDF document text
    • https://padaduzarunum.weebly.com/uploads/1/3/1/1/131164270/xamob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fef676e7b59b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_601b449e3429b.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/lasezag.pdfIn PDF document text
    • https://cdn.sqhk.co/jozunufap/FiiInkK/xofubusikuvufuranenew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 5556 bytes
SHA-256: d5e2f05a22cd75d576b8bbf849d17e967fb92f5f7eb0cd597d54f2e70c89f429
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 10404 bytes
SHA-256: e4c4ac0b6725bf6e8fa10c938a7749cbff3b1b4607fa8330026a9743b27e9933

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