Malicious PDF — malware analysis report

Static analysis result for SHA-256 268b50553433e5da…

MALICIOUS

PDF

80.1 KB Created: 2021-05-31 10:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6afa69a6cfa63f9a3e210dfaa394f801 SHA-1: a43adc84bfb3e66b4bff363a135d9c09d363b8f2 SHA-256: 268b50553433e5dabaa105806bdb24c9b734cad2907fbff6b2d5948e55d41eb8
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'how to start a political career in nigeria', suggesting a lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/strik?utm_term=how+to+start+a+political+career+in+nigeria In PDF document text
    • https://waramexebogod.weebly.com/uploads/1/3/1/8/131856917/4632248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_60054648cde54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481522/normal_5feef0178842e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_603ac27c742e1.pdfIn PDF document text
    • https://nusubilumib.weebly.com/uploads/1/3/5/3/135347333/571181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5fcbd599a68ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476756/normal_5fe34e97e887e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388162/normal_5feb421895036.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/8780078.pdfIn PDF document text
    • https://lobubizewi.weebly.com/uploads/1/3/1/8/131856209/40b9d2058.pdfIn PDF document text
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/5854994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5fe83edf2a1f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_6001bf2d644f7.pdfIn PDF document text
    • https://jasasexu.weebly.com/uploads/1/3/1/1/131163864/655652532a7d57d.pdfIn PDF document text
    • https://zomudefe.weebly.com/uploads/1/3/0/7/130740133/lesagurosemimepaba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5fe2b490cce9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374533/normal_5fccc84087e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_602d46f06a731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_6029a34589672.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/a6c37386-0b66-4177-ba30-0e0fc72a2ff1/76724157379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd2e42b-4642-4ced-8bec-194207d1e6c3/nuzidored.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70da1ae-599d-4df1-b5c8-60f9351be6a7/what_are_the_dimensions_of_the_galaxy_s9_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1aef55-8f0c-406a-9ad4-cfefe1e3507f/pioneer_ddj_sx2_bag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443c5de2-d0c2-4092-8508-12e917d7310c/zezonesul.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_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 5156 bytes
SHA-256: 2c181b453d19db4c05c43bc632ddd0d0242773b094214f80ca3ea4456a6c1c77
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 10836 bytes
SHA-256: bc7f1e2c07985fce162f82fee866daae0594eff1554cf83f88fc6b84245599d0