Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b180147c80fbb5b…

MALICIOUS

PDF

63.8 KB Created: 2020-11-14 02:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 66643936b0f0cb85c04d943d63102eff SHA-1: c68e17158ee5651cb4a51e030d65aece56d56a6f SHA-256: 5b180147c80fbb5be7dbc1a041c03e6702842ca4572ef88efe886c02e9b55ae5
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=manual+de+execu%25C3%25A7%25C3%25A3o+araken+de+assis+pdf In PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/resavipibidote.pdfIn PDF document text
    • https://tixosame.weebly.com/uploads/1/3/4/5/134523113/naluverav-malolof-xuvegulawemu.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/riwepiwuwuzil-pojini-pokam.pdfIn PDF document text
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/46ae9.pdfIn PDF document text
    • https://bameveba.weebly.com/uploads/1/3/4/1/134108569/6021351.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://fusefediwotedi.weebly.com/uploads/1/3/4/5/134589876/sugorijufur.pdfIn PDF document text
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/2862427.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/52450180074af1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mudurixo/best_thai_food_houston.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e4d601-bbbd-42d3-a064-9b2d82670b85/pegapejuzodusazopezupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900298c2-6835-4858-8abb-fcabe3a232ce/solar_electricity_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97506095-74cb-4b7f-ab0e-8072e055365c/43424738052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1c1c1b-7d06-41f1-a03d-ecd7a6764cd8/best_plastic_garage_storage_cabinets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecef13c-bbdc-40b7-969e-ec4945e1ad18/3315047751.pdfIn PDF document text
    • https://s3.amazonaws.com/ruletetunima/eastern_property_management_in_greenville_nc.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_off0000b7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BF 5788 bytes
SHA-256: a540a3db8fd7f7fd905fb6fe7511b0f5499a8bc43bcbae17f267e4f56195f34b
font_01_sfnt_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 12344 bytes
SHA-256: 810a8fda34b2663989d8a768b0bb3c9183d3dc20ba8e5512dc9bf4579ba6e77a

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