Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ffd03005d2fc0e…

MALICIOUS

PDF

68.2 KB Created: 2021-04-04 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b8cb4d6cd47f505ffffafa29f55ac7 SHA-1: 96409c6a8755280403e71c736f54840b51a37f18 SHA-256: 70ffd03005d2fc0eaf144f71315c184b7b1a802dd30e5f92b353080a538fe4e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains keywords related to insurance decals and application details, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=fair+auto+insurance+decal
    • http://closemaze.com/catalogo_de_cedulas_do_brasilxfs9r.pdf
    • http://herss.space/free_bible_code_softwareq1gkf.pdf
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/8476991.pdf
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fefb5332e346.pdf
    • https://cdn-cms.f-static.net/uploads/4450240/normal_6010f57af3d70.pdf
    • http://rmk4sale.xyz/bumeliferun9fp1c.pdf
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/cb01f4ba87c.pdf
    • https://vewekazetuxif.weebly.com/uploads/1/3/1/3/131379326/3bdb4f2588c9d9.pdf
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/gerojobi_vomikaja_vuzasuvajuweteb.pdf
    • https://cdn-cms.f-static.net/uploads/4380237/normal_6042d3f9bf300.pdf
    • https://mumabawof.weebly.com/uploads/1/3/4/6/134634692/3943352.pdf
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/2113492.pdf
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/78101d91d273874.pdf
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/tikofa.pdf
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/3aa2bdbfaebd3b1.pdf
    • http://kersita.fun/manual_de_analise_de_dados_faverolz4ru.pdf
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/7637966.pdf
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/feacb4.pdf
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/2921721.pdf
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/6be4a2f15e126eb.pdf
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/sodulibup-xilijat.pdf
    • https://lisebilapuwuw.weebly.com/uploads/1/3/4/0/134096741/1760368.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_off0000d083.bin
ec19fcf236a8089458500afeb752587855b2a3ab023a5f5ed3f61ae8b98a16a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 4888 bytes
font_01_sfnt_off0000e12e.bin
929e6f6b9d46098272e00781a041b3557a736d5210f900adbb4286b83b94b734		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 10344 bytes

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