Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d6e3bee979b1b0…

MALICIOUS

PDF

78.6 KB Created: 2021-01-08 17:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 26f5238d0aa8b27f3fb3f135ad52d7e0 SHA-1: 346c2cdac8d6dfaf52c61bf424d292a882042b86 SHA-256: 82d6e3bee979b1b082b2ee897056f6dccf9d29b406881efbfdfd92d2d47023bb
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a redirector link and a link farm. The presence of numerous external links, one of which points to known malicious infrastructure, strongly suggests an attempt to lure users to harmful sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffmen.ru/aws?utm_term=competent+persons+report+mining In PDF document text
    • https://static.s123-cdn-static.com/uploads/4427094/normal_5fecd0aa60a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f97b16c25c97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_5fdc0e39d3170.pdfIn PDF document text
    • https://dinorega.weebly.com/uploads/1/3/3/9/133999175/diziliraze_nekuwoduburozew_vatesereza_bakogimuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5f931a8cd8e94.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/gifiz/riwusokafebapimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2e5332-3bd7-4fa0-a540-62103e784c59/dana_30_axle_truss_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94d844d-d22b-436d-9964-940d1e62f528/batebusegobat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f890dc47-e41a-4a42-a0fe-f2654738fea9/registrar_of_contractors_washington.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/consumer_reports_digital_subscription_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/digozolirebuterabiladesol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfd0ecc-3c19-4f85-8d66-713dca784b9e/33628454138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b025245-4180-4b65-b5e4-f857f373c184/lost_ways_book_amazon.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_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 4804 bytes
SHA-256: 5f2f43abaa349863f6e6f019aea52c0e8b8ebedfc76fdbb84c72462d0cebe40e
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10912 bytes
SHA-256: 2cc79ebf5438965935e8b1bc0d20792617c856cab300b518cf0187812a15634c

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