Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c69e24c81e95e1…

MALICIOUS

PDF

82.0 KB Created: 2021-06-02 06:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 506948aa41877057175f6e7227e683ac SHA-1: 0b57840e8200a118d6392f7a97eb7f02f04826b0 SHA-256: 09c69e24c81e95e17a3ba0e2d990da721f86456e88c82ce7f48c2dd9bb5279da
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to host phishing content. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly support this attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/pbw?utm_term=how+to+fix+jbl+flip+3+charging+port PDF link annotation
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/1497838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_603983c17521b.pdfIn PDF document text
    • https://jawozararo.weebly.com/uploads/1/3/5/9/135964334/rokibefewolat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_60278eaab2b3c.pdfIn PDF document text
    • https://dunopugagikevu.weebly.com/uploads/1/3/4/7/134728147/1696721.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/3def6cbc431f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_606ad712ddd36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488558/normal_604360cd2fc83.pdfIn PDF document text
    • https://rifewageza.weebly.com/uploads/1/3/5/3/135349229/6502727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_604cc66b81484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5ff9211fc683a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5fc6dc8b7be34.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4480745/normal_60b28ac184683.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/xebigemutaga-zatufekasute-dumuduturov-diwulasedo.pdfIn PDF document text
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/ffc03.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/667b2781-2cab-45d7-bffa-d2525f6f04e3/7th_grade_book_review_template.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413268/florida_civics_economics_and_geography_teacher_edition.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/how_do_i_connect_my_ipad_to_my_brother_printer_label.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382db0ae-5bad-4b64-809e-fda7b3658df2/79494087705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c390c2ef-94df-496d-9796-28a59285c485/lesco_spreader_parts_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 5272 bytes
SHA-256: da6656b3dc18095973797e20c8f7a505a1b3dfaa7e656e6124fe068f76d04263
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 11200 bytes
SHA-256: 86a5418539abb0a499b397e76b0ceb7bbc012d909f99126951a70c759c036851
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2