Malicious PDF — malware analysis report

Static analysis result for SHA-256 781b14cc75dd527e…

MALICIOUS

PDF

74.9 KB Created: 2021-04-07 04:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39109e516972e7b7236ac343b4df0d7f SHA-1: 898fa5245f52caea9f76502b5f75bf44aa9c1b24 SHA-256: 781b14cc75dd527ec45045555d140f0ffed182651e2d759aeac5f5986ab4bda9
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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=meaning+of+business+plan+pdf PDF link annotation
    • https://telemoradez.weebly.com/uploads/1/3/1/0/131069753/b0121d5b0f.pdfIn PDF document text
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/4e1dcf.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/jobebowuriduvajobosuz.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/kiwapoguvobole.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/82971121008.pdfIn PDF document text
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/xizuburok.pdfIn PDF document text
    • https://wireluxibesoz.weebly.com/uploads/1/3/4/4/134402736/434098.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/7981147.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/fuvolomunoled-lopuwukosutobes-muxatowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e02aa9-b46f-4c03-8df9-5660734addc2/dyson_ball_animal_2_total_clean_refurbished.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_d64cb0edb936415ca98d1f6e1c73fd46.pdf?index=trueIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_3231f925abff41d1939ee252090304ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31861777-8070-4411-83ab-d31071df1930/how_to_remove_ge_gas_stove_top.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1819ea69-1de5-485f-9b74-4d3d722675e2/what_to_write_about_nonfiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a40bf6c-8b72-4cf6-adab-40868d867d7b/moriwapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7368a1b5-ea4f-434d-9502-bba23acfa33d/korn_no_place_to_hide_bass_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6318492-16bd-4d2e-ba53-a81d6ca6be24/40452114115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf826ba-3cd3-486f-b0a8-1719969ee929/57158513543.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5260 bytes
SHA-256: 19338f63880b8e2d65dd5ad0823dcc180a6d3926192f7bc322f76de8f80ed4da
font_01_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 10340 bytes
SHA-256: efdb13189ce0f8e136064a8426fecfde2a2e7ac88d9f23c3bdc1095daecbffef