Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dca16e592d51548…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 09:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52ed086c88665a6c2625dd43b575f0d4 SHA-1: 2370110f5b5a1add353bc0ff6ecbfcf48c3b638e SHA-256: 8dca16e592d515484079b51b5398837c3cc6ba835b789a73703fed72a9643739
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to a network of websites, likely for advertising fraud or to serve additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jumiwimov.ru/award?keyword=factores+psicosociales+laborales+pdf
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/51b77e114039.pdf
    • https://cdn.sqhk.co/feripamapuv/K2Ujhez/among_us_mod_minecraft_1._16._3.pdf
    • https://wuluvaxezipow.weebly.com/uploads/1/3/5/3/135393263/desezabupozodujazefi.pdf
    • https://cdn-cms.f-static.net/uploads/4446399/normal_601359aa78931.pdf
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/nesoka.pdf
    • https://cdn.sqhk.co/lexuxeza/chd0ii3/animal_cinema_video_songs_telugu.pdf
    • https://cdn.sqhk.co/povewepalu/CjaigHt/midway_bally_ms_pac_man.pdf
    • https://cdn.sqhk.co/resilano/0chcigX/joxokumudek.pdf
    • https://tepadomuxufebe.weebly.com/uploads/1/3/1/3/131382092/4040573.pdf
    • https://cdn-cms.f-static.net/uploads/4384149/normal_600d8c4db2f0c.pdf
    • https://cdn-cms.f-static.net/uploads/4369495/normal_603c5660ace45.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/6df51c2987c.pdf
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fe83801d641d.pdf
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5fc83568e7640.pdf
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/76baa30a26.pdf
    • https://cdn-cms.f-static.net/uploads/4366993/normal_602857704bf31.pdf
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/situfejubad-bufowixifu-limiwadikuwime.pdf
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/mibimalu.pdf
    • https://cdn.sqhk.co/rutisifelom/8GObBgc/80191089726.pdf
    • https://cdn-cms.f-static.net/uploads/4366947/normal_6035a2ba30f23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000eae5.bin
ff18312db32b0dd59ba44787e0d500cc73fdb115e1184c375659c8c53b35d134
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 5244 bytes
font_01_sfnt_off0000fcc1.bin
76e90820121872302d41e27d94f4d5bc54bd2ff6a1e978491f785dc5a65bd02c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 11656 bytes