Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4f296dcc818bcd…

MALICIOUS

PDF

144.8 KB Created: 2021-02-15 09:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 42009727bbe11278eb07d5cda07ec904 SHA-1: c5de25228fa83a654a3a98ae894e4d4e950f8a05 SHA-256: 5f4f296dcc818bcd887a9c18f4eb036a076d5f76d78071242ecb7a592ffcbf0d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to network configuration, potentially serving as a lure. The presence of external URIs indicates an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=show+ip+interface+brief+extreme+switch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5fee8c21ec760.pdfIn PDF document text
    • https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/parupu.pdfIn PDF document text
    • http://gtomishebs.xyz/412684801047wk3o.pdfIn PDF document text
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/7307104.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/eIJa3YU/xerosexurilijanaduder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480594/normal_5ff518fc7b94a.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/jieVhbk/who_is_christian_grey_based_on.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/eicvjfB/33898261084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_602307389f335.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/gjOrgdC/sewar.pdfIn PDF document text
    • https://kitikifotise.weebly.com/uploads/1/3/5/3/135321604/wogifo.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/ijnjbjc/skin_black_mole_removal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_600c061b8e970.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/jiicntG/baby_sloth_in_spanish.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_off0001f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2E6 5624 bytes
SHA-256: 0ddebfc65aaa34e012baba2306883596de2baedeedc13baef8338a4eb0161969
font_01_sfnt_off000205ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205EF 13904 bytes
SHA-256: ef16a828d430c380037f11136588564b5df0638a49f9d30913830b432db3b79a

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