Malicious PDF — malware analysis report

Static analysis result for SHA-256 59580b4c96ec4959…

MALICIOUS

PDF

68.9 KB Created: 2020-11-19 01:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91f446c473a9f0693e82614e2a307e41 SHA-1: 1bf9d4542d6f7e84e67116e42c3985695b3b58a5 SHA-256: 59580b4c96ec4959c5d2efbd52dcfc719fb301c80366846cd4405a2734f40cfa
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 at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external links suggests a link farm or phishing lure, likely intended to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?utm_term=pedra+do+telegrafo+illusion
    • https://noderewowiful.weebly.com/uploads/1/3/4/5/134596184/kinolipubofeled_gufun_levowujowasoxo.pdf
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f8d58ff28fbb.pdf
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/4916bb46802eb8.pdf
    • https://cdn-cms.f-static.net/uploads/4422367/normal_5fb00be8a1c96.pdf
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/karajugokinikefaveru.pdf
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/3542154.pdf
    • https://tamalokumolegi.weebly.com/uploads/1/3/4/6/134656593/2494463.pdf
    • https://gubojipupulep.weebly.com/uploads/1/3/4/3/134359502/4fddc9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/64ddd4f4-992d-4dea-a4f9-2b0643f613e2/armored_core_for_answer_white_glint.pdf
    • https://uploads.strikinglycdn.com/files/09ca5720-1654-4d21-8f40-a28ba4d3e39e/46979892812.pdf
    • https://uploads.strikinglycdn.com/files/462f0f13-d068-420a-87aa-ac7bf84d4931/manual_do_horoscopo_chines.pdf
    • https://uploads.strikinglycdn.com/files/0aeca5c7-9c89-4ac5-802f-1423d863ef70/budewu.pdf
    • https://s3.amazonaws.com/bubeto/grand_funk_railroad_closer_to_home_meaning.pdf
    • https://s3.amazonaws.com/temujonuwu/punebufipavep.pdf
    • https://uploads.strikinglycdn.com/files/61561478-7432-4957-a760-c6775b83f28e/machete_ao_machote_que_significa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d159.bin
80a8a91e7f2468d6c06bf2171f89f47fd3186a1436eb7eb39b58481486e88c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 5076 bytes
font_01_sfnt_off0000e2ac.bin
48705dbe342c7701e1d95e755bdc545394f4d052e21bd26290c26f409dc8fe19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 10760 bytes

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