Malicious PDF — malware analysis report

Static analysis result for SHA-256 f946b356e9ea1949…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 19:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d90ce2302447d584fab4784821dee7b SHA-1: 8e7f5f2706d74ef2706a4a591c3fe472cea84af1 SHA-256: f946b356e9ea194946476f1d3dbb7353f1a2e6cd26d131cfa8a73b5655920590
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to salary information, likely to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=how+much+does+a+manager+earn+in+singapore
    • http://wofurasosezisax.mywebcommunity.org/materi_akuntansi_biaya.pdf
    • https://static.s123-cdn-static.com/uploads/4496597/normal_5ff175e320975.pdf
    • https://static.s123-cdn-static.com/uploads/4405206/normal_5fdf85f7f04aa.pdf
    • https://liwufetut.weebly.com/uploads/1/3/4/5/134596667/tazutebikizeg.pdf
    • https://cdn-cms.f-static.net/uploads/4487641/normal_5fd93c77ea950.pdf
    • https://cdn-cms.f-static.net/uploads/4412382/normal_6011e71d8756f.pdf
    • http://liwexun.mywebcommunity.org/analytic_geometry_6th_edition_douglas_riddle_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4450250/normal_602b59c63a1de.pdf
    • https://cdn-cms.f-static.net/uploads/4482858/normal_6062e40db5699.pdf
    • https://cdn-cms.f-static.net/uploads/4445739/normal_5fd3a918a506f.pdf
    • https://cdn-cms.f-static.net/uploads/4367911/normal_603e18b2203bc.pdf
    • https://cdn-cms.f-static.net/uploads/4494677/normal_605c3582ad230.pdf
    • http://pexawegowe.mywebcommunity.org/does_snow_whites_prince_have_a_name.pdf
    • http://vepenuvix.mygamesonline.org/probability_density_function_questions.pdf
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/gudutepemojume-muxarukapazogiz-gosofetinesi.pdf
    • https://cdn-cms.f-static.net/uploads/4425010/normal_6066ffd4efe4b.pdf
    • http://sowoxapexemex.sportsontheweb.net/42124158990.pdf
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5fc7c57453d98.pdf
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/b85dea.pdf
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/manajusovetikur.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_605f5e41951b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gitodake.myartsonline.com/central_dogma_translation.pdf
    • http://lanosebezazov.onlinewebshop.net/how_to_do_mind_control_techniques.pdf
    • http://junaken.onlinewebshop.net/97909760241.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_off0000f502.bin
331257356e9f967f0b4364a55a9ea837f4be592461bc0b8bc7099392cc4a84c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 5312 bytes
font_01_sfnt_off000106ec.bin
8223d8e30b66f101a9750ce285ac42d2c6e245fade1cf8736ba6bb12d5dfcf43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 10888 bytes
font_02_sfnt_off00012c44.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 4324 bytes

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