Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f3a12a4593043c…

MALICIOUS

PDF

65.2 KB Created: 2021-03-25 08:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fd5b3c30718ff10479145331bb59716 SHA-1: 9e00f8d9d4f06585ca8d5a75c92c7208cbdf203c SHA-256: 34f3a12a4593043c57ae1b13c6468cc86b1c0b72cc85d563b7bdb6476ce41a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF contains a large number of external links, many of which are to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=public+finance+and+public+policy+by+jonathan+gruber+pdf
    • http://mejuzemirefewuk.iblogger.org/analog_and_digital_communication_book_download.pdf
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/mawugereludor.pdf
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/xolirikumami.pdf
    • http://wilitubejibo.iblogger.org/69908907446.pdf
    • https://tedamitaza.weebly.com/uploads/1/3/0/7/130740371/ac073.pdf
    • http://kuwofadenokul.iblogger.org/malaxitalisimusaroda.pdf
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/nuwuguri_zukowe_fowejise_deleme.pdf
    • http://pagujubemozakev.22web.org/fugenolixevepowovajuwite.pdf
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/2600235.pdf
    • https://vogavowaxataner.weebly.com/uploads/1/3/4/2/134266619/relima_xutulurun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_7cfacb3af2424648aefb61d35abf0264.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_59aa3b37c6e64b10b9d5cff59d2b8659.pdf?index=true
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_c4135cf5b2e14da098f011830a7e3059.pdf?index=true
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_1ea7ba8ec61447a5b3d2f462802282af.pdf?index=true
    • http://duruvuvo.rf.gd/61645216536.pdf
    • http://genividi.epizy.com/chick-fil-a_nutrition_calorie_counter.pdf
    • https://90b6428a-f85d-4fb4-90f7-6cca40d0dc23.filesusr.com/ugd/55544c_ccb68ab9b2b04f6eb91eebefff46dc40.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c15c.bin
2a93bb63f6c73ae6880195cf4f6b057c15c097c11df3794494bb6eaa8c6e6805		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC15C 5560 bytes
font_01_sfnt_off0000d44d.bin
6ea7b62850baaf3e5cdca0b6f605fc18e2cca1c1831bd10a538a03010166f0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 10284 bytes

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