Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62ec5b95a022477…

MALICIOUS

PDF

74.3 KB Created: 2021-06-10 20:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 24ca429ab812d9fd386fe24bc376b583 SHA-1: cd54fe7bce70c35268bd3993806357e41e3e1067 SHA-256: b62ec5b95a02247737acf94dc0716a3cec0c053b1353d95550099bbe7b1c0917
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/pbw?utm_term=subway+princess+runner+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384037/normal_60c0fcdb6a68a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4367951/normal_60b3a635c6f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_60544dc1c93ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_60013a1bdd267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_605042bd8d217.pdfIn PDF document text
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/1894813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_6054eea905556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501962/normal_5ff9a45029da5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_604a3ac52c02c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408721/normal_604d7922c19bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_6029b4bbee130.pdfIn PDF document text
    • https://paxedobopesenun.weebly.com/uploads/1/3/1/3/131398064/7462793.pdfIn PDF document text
    • https://zogomidovuga.weebly.com/uploads/1/3/1/6/131636914/3606670.pdfIn PDF document text
    • https://fajevubesupuvax.weebly.com/uploads/1/3/5/3/135387480/810a007322131e.pdfIn PDF document text
    • https://xupumoga.weebly.com/uploads/1/3/1/1/131164417/zuzezaxolavugada.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4448337/normal_60b6fda844ef3.pdfIn PDF document text
    • https://dinijituwit.weebly.com/uploads/1/3/1/6/131606252/kuvejize-jasoxexiviwuto-xuxid-vegemixasapebap.pdfIn PDF document text
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/sefosexin-mimofom-velubigupetos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_605b4f7c18267.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/9817319.pdfIn PDF document text
    • https://bikirufiw.weebly.com/uploads/1/3/1/4/131452989/e4db5d98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jadubunid.pbworks.com/w/file/fetch/144809430/achyutam_keshavam_krishna_damodaram_by_vikram_hazra_mp3_free_download.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/fundamentals_of_engineering_drawing.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_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 5624 bytes
SHA-256: 6e226ecb828af942797e556e5ee6e9ea3d6bfe64590a04c6f0fe92ebc0db3549
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 11476 bytes
SHA-256: 1d154a8cc2adc8bf9048cdc04eb090e75d0e1d9657946e7670840a59768ad01a