Malicious PDF — malware analysis report

Static analysis result for SHA-256 2740df17d27c0d60…

MALICIOUS

PDF

68.4 KB Created: 2021-02-15 01:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4daca6354f8656853d4dd90b8fe5225b SHA-1: 702045a639f002ed7d06ee10e9d7b4d5f94f2612 SHA-256: 2740df17d27c0d60c2a73998456e5784af64a81004ab758e4768f4b21296800d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'crophysi.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious URLs suggests an attempt to redirect the user to a harmful site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=fundamentals+of+pathology+sattar+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5ff0aa4bd195b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_601f8f1eb1683.pdfIn PDF document text
    • http://clobuss.ru/bishop_score_interpretationcnn31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460678/normal_5ff0c9e9a910d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485695/normal_5ff4b54e417d6.pdfIn PDF document text
    • http://zoo-taxi.site/exercises_present_simple_negative_pdn0x1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_6029a83858420.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/774514233314fu9z.pdfIn PDF document text
    • http://topfrag.rip/piggy_call_mod_granny_prank_videom3dbs.pdfIn PDF document text
    • http://creditreportusa.info/disafejelagosikika4.pdfIn PDF document text
    • http://new-leggins.site/beginners_guide_to_seo_moz6bs6o.pdfIn PDF document text
    • http://clientesdkb.com/exercicios_de_porcentagem_simplesdakze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420013/normal_5fe06825ac9eb.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/tadevewuju/audition_mobile_th_mod_apk.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_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 5512 bytes
SHA-256: 75b4219c4db8d50e2056e291227c4bd59923c2c0c93906fe92dab6f64be112a7
font_01_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10504 bytes
SHA-256: 5c4fbc925353f6a0fbb7af7fd156d6846cd11cc5b1ae40a130e3220a65e462de

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