Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cb62a6d0b44292…

MALICIOUS

PDF

96.9 KB Created: 2021-03-16 10:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 961f49d423bebdf89dfb3df4030f994b SHA-1: 598e51a775816cf664dd7f64b874d5fbd928990a SHA-256: 94cb62a6d0b44292cc232ceae41b94db4833f688768ffab9736db09c76732198
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/strik?utm_term=ap+human+geography+unit+1+summary PDF link annotation
    • https://cdn.sqhk.co/zuxatotukaru/QgiSMjd/degor.pdfIn PDF document text
    • https://cdn.sqhk.co/rojogonezejo/ojfhg8A/garoxoruziwugoze.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/xijjbhf/inside_out_sadness_quotes.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/ziderufutu-nawupododaw-fuwirefumu.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/qnbK5ha/73830826415.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/wimafixatono_nesajesipo_pinamaleru.pdfIn PDF document text
    • https://morapunepa.weebly.com/uploads/1/3/1/6/131606469/3797953.pdfIn PDF document text
    • https://lusovajilabijix.weebly.com/uploads/1/3/5/3/135351537/170421.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/3793719.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/KjdEKgf/jevur.pdfIn PDF document text
    • http://logusiba.22web.org/ragot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1a76b5aa-7330-41c4-ab87-d3306d11c67e/pozusirovijuvopubifuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fbab50-eaa0-4909-870a-745cfb3ccdb1/which_beretta_is_made_in_italy.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_15e1ea81b31e45aaa2cc39383e6edcdd.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_137fb6003161416eb3f216e16d08e35a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dccd411-4b82-4801-a958-2e3a45d23cd3/graphic_designer_job_examples.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_c683a7974ea249b98fbd7a5d79db2c08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87c3fa9-c18e-4bc0-9a5e-f8109ec11979/how_to_clean_general_electric_p7_automatic_oven_cleaning.pdfIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_cbeab19178e0461c82b40417aa546e00.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_4be61a8a9c424ae8bd3efa82510980c2.pdf?index=trueIn PDF document text
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_acb5e6b67b52453a8d8cfcf3f1cd108f.pdf?index=trueIn PDF document text
    • http://bajobakokela.epizy.com/felazasajotebufikedaboge.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_b8049ffdc9414f43818109f3b5370664.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 5228 bytes
SHA-256: 517ddcc936b54473ca01182e8413f4d664b41b9e94a43ff103ddd99d96eb4099
font_01_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 11480 bytes
SHA-256: b9d1c0f06370d9b6ee9df786b15692c1af321b7b071dcebfc7bc589b2be82867
font_02_sfnt_off00014b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B01 16116 bytes
SHA-256: afbdbd02dec82d9be1e07df9ab92004d6e2996c86bdcb9c83a2c1f8ac0d08daa
font_03_sfnt_off00015fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_04_sfnt_off00016d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D8E 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d