Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c77b4768c75d19…

MALICIOUS

PDF

84.6 KB Created: 2021-05-22 10:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2fdb355cbd2daf4b055f43ff483bcbd6 SHA-1: 2442db911c3aed1d2bc1bce6899c972c66da8af2 SHA-256: e1c77b4768c75d1912f61270c6ac731aa07384bb2a64f5606ac9f3c77acf3e75
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on link farm sites, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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
  • 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.
  • 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://leonvi.ru/strik?utm_term=t%25C3%25A9cnicas+e+instrumentos+de+recolecci%25C3%25B3n+de+datos+tesis PDF link annotation
    • https://zipesonavizi.weebly.com/uploads/1/3/6/0/136052153/gaputefatiluzi-ravazise-tidava-xarefafipuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_601474ab8b04a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_604d3d68494d2.pdfIn PDF document text
    • https://kowadesilokawu.weebly.com/uploads/1/3/4/2/134265693/fijud.pdfIn PDF document text
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/97b576a849112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_606006e6708c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5ff209eb63f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_5fd7ccd6a0816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5ff3478873274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_600a0c3927664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5fe8d86b87d77.pdfIn PDF document text
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/demadotowareboz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_6027ba878f6ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446512/normal_5ffea3c117723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_6052fd4920a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fd644cd1c3b8.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/kiguteperilodu/79315562779.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/what_is_basic_calculus.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/oracle_database_client_12c_release_2_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/89258728398.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_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 5312 bytes
SHA-256: aa13842cd110488de290e73a6ba6649872a04df25147682742736286cbc6f5cf
font_01_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 12840 bytes
SHA-256: e0d6a8b4e82778c0660fe48d253fa1e05fe13df20ae7c45beffaf9b551c9af6c

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