Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f42f4589c5e206…

MALICIOUS

PDF

71.6 KB Created: 2020-11-21 02:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a50cf49a3714352233e4fcf1d41b428 SHA-1: 99cb6746f098e5c534f1459fbcea9db4a2ec20a0 SHA-256: 76f42f4589c5e20682261c546e976c6d79eb9a57d7692e248dc37b29736226f5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=convert+14c+to+fahrenheit
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/kubugulurojedoxutu.pdf
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f8cb8afa7a42.pdf
    • https://suvosimi.weebly.com/uploads/1/3/4/6/134688706/vizog-jokol-xelitu.pdf
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/kuxelofebod_kumewuxa_powubululime_fusufezisitov.pdf
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/megibi_supeziberoseb_dadawalulufiz_rakuvagibujod.pdf
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/405052.pdf
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/a0091417868c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a6ad7f2-18d7-4310-831a-0d513196769a/ac_odyssey_ashes_to_ashes_save_baby.pdf
    • https://uploads.strikinglycdn.com/files/d7b3a083-88d9-4e97-bee9-711ca18c9353/kisefebawu.pdf
    • https://uploads.strikinglycdn.com/files/27c6572b-00dd-4dec-ab79-a6d6969bc735/peter_pan_la_gran_aventura_pelicula_completa_en_espaol_latino.pdf
    • https://uploads.strikinglycdn.com/files/46dc01f3-344c-42b8-9277-00b64eb7d402/22130407877.pdf
    • https://uploads.strikinglycdn.com/files/ac1a5263-de47-4b4c-88ea-8c44dd8e5ced/temiborewadimapud.pdf
    • https://uploads.strikinglycdn.com/files/0ec5f116-3834-4474-9337-616d553cf91a/74376598635.pdf
    • https://uploads.strikinglycdn.com/files/c3532be5-0ba8-4ebb-918f-0446213dc2c0/40321060823.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb58.bin
6f2a6df54add4989ddb944bf337afdbe14cfe9709f41fdb3d2996e2e7fab70a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 2888 bytes
font_01_sfnt_off0000d59c.bin
e4395830c26da571d25f8cd35d9ea31caa4f769486284090c6dfa9c0bd7c9668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 4864 bytes
font_02_sfnt_off0000e634.bin
ca50bcd9af2485c0f57622a5ee947c6a24aa310482cb8e5307552ed269ecc598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 12800 bytes

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