Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58c4fb63e762082…

MALICIOUS

PDF

83.6 KB Created: 2021-04-07 22:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0143dd566101d05ddb1b3d75e18340ff SHA-1: 8ed626b8886d7ec2a72bca66de7495876f8088e5 SHA-256: c58c4fb63e76208248fd6da3920b55a1c36dfeae633e40583465d310d66666e3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, indicating it functions as a link farm, likely for SEO manipulation or to redirect users to malicious sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to lead users to potentially harmful content.

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
  • 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://soxebez.ru/123?utm_term=imdb+parents+guide+die+hard+2 PDF link annotation
    • https://cdn.sqhk.co/xewasejeve/707ijLz/burger_king_breakfast_menu_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480904/normal_5feb81c6d2056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_6018b11f4b820.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/9685099.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/cjhioax/stick_cricket_20_days_of_t20.pdfIn PDF document text
    • https://xojobade.weebly.com/uploads/1/3/4/3/134385351/2f8371fc4.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/acbcccde58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_6041ad07ce157.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/2611727.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/haoiejb/97919562163.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/40be41a6-d8a5-434c-80ff-c3babfcccac0/sakinelifof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c2a70c-727a-47b1-990b-cdca2cb34913/20099504820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4e0249-0a8d-4115-83e0-57e5b4a93a32/40m_delta_loop_vertical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6114f30-ab4e-4dc2-bb40-ab3c5f50a29b/can_you_sync_jawbone_up_with_myfitnesspal.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_25b1c05630fd453a923de51f4e025247.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98eb1d3-27a4-4037-8a04-d87ea5e4a136/maat_the_eleven_laws_of_god.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_fd09c343f55a49d291ecc185fa1e90fd.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_93ea3a2e35bf4a938f93cef911780d9c.pdf?index=trueIn 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_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 5552 bytes
SHA-256: 0f8347076988fd59ddd64bf86c0efaf9cbe0b6c0c0fbe6ea635b2ee42978d659
font_01_sfnt_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 11444 bytes
SHA-256: cda34208b65211472f3971f1b59f7fbc529e8026010a3d5d7cb28503ebf570fa