Malicious PDF — malware analysis report

Static analysis result for SHA-256 19561bc42fcbc343…

MALICIOUS

PDF

66.3 KB Created: 2020-11-21 03:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 351de80d2490d2ff2f3e5704b00d9703 SHA-1: 13c708f01487522000ceae4648457642493e3351 SHA-256: 19561bc42fcbc3432893421b58f84d92601d1e0a1e806616a59f8d82e1ced1a2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are part of a link farm designed to redirect users to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=sinkmaster+950+garbage+disposal+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f8d6be040b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5fafb518d3f7d.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/pixizi-wugegez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_5fa67075adc22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5fb838511c230.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/7611582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_5fb767e29e8d2.pdfIn PDF document text
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/9023677.pdfIn PDF document text
    • https://taneromujek.weebly.com/uploads/1/3/4/6/134611199/dudinij-vetomivalan-gubijo-vefamejawimire.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/donake/buzosigusokusebavovog.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/fufobanolevemuw.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/17318547456.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_off0000c64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64A 6008 bytes
SHA-256: 08c9afc84e39939f640d9dabf14960e1366b65bf8b95fc4168a522e2f9d4c474
font_01_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 9900 bytes
SHA-256: 6e66b0410c2371218d8ed8f79fdc172945b75027130c59a77824ba1f8623edc8

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