Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ad57b528cd5f6b…

MALICIOUS

PDF

67.3 KB Created: 2021-03-16 13:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4015472d0c85dd42e4877fb41410e31 SHA-1: d09154dce260bb968b3d8c3a512aafc758607615 SHA-256: a4ad57b528cd5f6b2bcddac2fc434766ada6918735fbc5f4a383f12cab16eaab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. One of the primary URLs, 'https://botokaw.ru/123?utm_term=jiyo+re+bahubali+audio+song++mp4', appears to be a lure. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely to download a second-stage payload.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=jiyo+re+bahubali+audio+song++mp4
    • https://cdn-cms.f-static.net/uploads/4485329/normal_5fdb517ac3e39.pdf
    • http://saganofodevuset.22web.org/32954542006.pdf
    • https://cdn-cms.f-static.net/uploads/4408983/normal_603f7727e4557.pdf
    • https://cdn-cms.f-static.net/uploads/4382429/normal_6038b574b1cf3.pdf
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5ff8fc8da3df8.pdf
    • https://static.s123-cdn-static.com/uploads/4409602/normal_5ff670b94ff47.pdf
    • https://cdn-cms.f-static.net/uploads/4367287/normal_603ce5922ebc3.pdf
    • https://static.s123-cdn-static.com/uploads/4424630/normal_6006ae17db3c5.pdf
    • https://cdn-cms.f-static.net/uploads/4387701/normal_6014e51173e12.pdf
    • http://zoxulojiliboro.22web.org/28271499069.pdf
    • https://static.s123-cdn-static.com/uploads/4476590/normal_60063c890b09c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xufujofaleki/ansible_from_jfrog_artifactory.pdf
    • https://s3.amazonaws.com/lusegokaves/faust_arp_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/33eca580-9e26-4d1c-b56e-a57a53f85bdf/wulopazis.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_609b7d0a4e354083a670a03b65f9105e.pdf?index=true
    • https://s3.amazonaws.com/wutisigila/19075747491.pdf
    • https://uploads.strikinglycdn.com/files/7f84dc58-56dd-4f7a-a1d9-0f7587b1ac4d/where_to_watch_big_little_lies_season_1_for_free.pdf
    • https://s3.amazonaws.com/datarofapakil/19650028479.pdf
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_bcd4e89a2f9c4caf95f01212ab7d0086.pdf?index=true
    • http://kivekovojador.epizy.com/juvilenabanix.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_off0000c87c.bin
c0febb74f01da83ebc0a0094abdefd5a5879e8daa620481ef3cea51bd4b0e228		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 5692 bytes
font_01_sfnt_off0000dbb1.bin
8531817b2daac9a4ab152332a3f4149dedd65db302fd17378e03f2fb0cf94d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 10644 bytes

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