Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e6b719b907fbc4…

MALICIOUS

PDF

89.1 KB Created: 2021-06-07 01:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fcad8bf59143f379db1e7496935ec322 SHA-1: 5c37827d15d8ae40734c9d917f351c2e68bafa92 SHA-256: a7e6b719b907fbc4c8e2c69b70029beb6db301b2e2adcfe1e05533e654c109b1
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 0.9994

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://crewmak.ru/pbw?utm_term=harley+davidson+electra+glide+cvo+2018 PDF link annotation
    • https://xuloxaxofe.weebly.com/uploads/1/3/5/2/135294954/d2b6f13c0406b0f.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/vasaze.pdfIn PDF document text
    • https://rufibomorogad.weebly.com/uploads/1/3/4/5/134505720/kemazexe.pdfIn PDF document text
    • https://bojotipawotos.weebly.com/uploads/1/3/2/6/132681617/xuzik_likelof.pdfIn PDF document text
    • https://lupojevoken.weebly.com/uploads/1/3/4/4/134468235/8743498.pdfIn PDF document text
    • https://dibonividuz.weebly.com/uploads/1/3/4/8/134885927/zemagijumosolubap.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/6924069.pdfIn PDF document text
    • https://bazulezegit.weebly.com/uploads/1/3/4/3/134372971/b407307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaporezikumu.pbworks.com/f/cleaning_and_shaping_of_root_canal_ppt.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/f/how_do_i_cook_a_small_sirloin_tip_roast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ef4f74-8996-4a9e-af5a-5bd8d8d9739b/39641639089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a9c944-b58c-4fc4-8978-71f6d5f755b9/html_tags_and_attributes.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144712788/32735511182.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/f/boxixizagofajabejejowez.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/25461025381.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/adventure_time_finn_x_huntress_wizard_fanfic.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144522306/63297473951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dcd2fc-96fe-4114-b453-fe50029ac19a/samududere.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/vefepalibepobesizubogamum.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/f/ramayanam_malayalam_book_free_download.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144756003/49099859392.pdfIn PDF document text
    • http://kedefoviraj.pbworks.com/f/26128875146.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 5748 bytes
SHA-256: 6e39d1669d2f63a596ffb35a6837fb08eba752fe4c1959a51e2b7b4507b0724d
font_01_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 11360 bytes
SHA-256: cea5f1ce7074b08646434e7ef037ed92ab1fd5e084b64d19c69db690de65a8d1
font_02_sfnt_off000141f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F3 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7