Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faf704b57ff75c6…

MALICIOUS

PDF

104.3 KB Created: 2021-05-17 12:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d649a9bef8e6c2b80767bbd332a0d426 SHA-1: 24987bc98fd8e07dd28d9864195c2bb77791a3af SHA-256: 5faf704b57ff75c6de974337ae0c48ea13c78b727baaf03760609b2b2ddf7897
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, appears to be a lure for 'Mainstay folding table instructions', likely to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=mainstay+folding+table+instructions PDF link annotation
    • https://cdn.sqhk.co/kisibijobu/iaiijhy/24027405683.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/ijdUgiC/tozelareguzosoxovanopo.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/9213290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453337/normal_5ffa515cbdf27.pdfIn PDF document text
    • https://loribipusav.weebly.com/uploads/1/3/1/3/131379532/64f077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_60067c9e8c0f1.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/5853126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495860/normal_6049f809110b6.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/hbghXCe/32339673984.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/4137964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_6049c85f7956a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_601f04c4ca2fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_605c8c3cc8f9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_6cedd9746e55460badd36bfcabff6aa0.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_47e2f89f00d9452abeb7b0167ffef184.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_a91d3f71527c46ce96d5f9e675c9183e.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_85b6959bed4d45e3b67703c8944adc06.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_4c2bed3600f34a3c9b03c72bc29e25c2.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_227428a51a8744d8872b0f4d728bbcc5.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_8ee11c689acb47a4bc9e932c67c15053.pdf?index=trueIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_9c9a96ff12d7413db68527a38fb57794.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_07ee77e73f7f436db90e48304483a834.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_off00015830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15830 5436 bytes
SHA-256: 6f59d3f470538f8369f81210bb1aae155d15b8694d1c40bfe4cc9354290adfc9
font_01_sfnt_off00016ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD1 11868 bytes
SHA-256: e652cfd9b969de306eb9c457941410e7d4c8579f86b5612e155f9b98a5da0e39