Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf514c38ebbeb642…

MALICIOUS

PDF

83.7 KB Created: 2021-01-08 18:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9fee1a6a82c931cad9f183d146af1a14 SHA-1: b9b5453c577810be7cade9530bc24eaf61e63db5 SHA-256: cf514c38ebbeb642c74b0750ed1106081e5cce19b41e00821d134b2b42e6a81f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to redirect the user to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=pine+richland+band+director PDF link annotation
    • https://cdn.sqhk.co/pelotuwew/hdbhfig/navneet_sikera_ips_current_posting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_5f9992bd25d7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5fba64c8605fb.pdfIn PDF document text
    • https://gukenefekofuga.weebly.com/uploads/1/3/4/5/134588358/1534600.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tifuxasorelav-sunagutigu-gikisifexixabot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5fd0d5a24a640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5fbd27b341756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5fde0fb1cc870.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fde7eccb53c3.pdfIn PDF document text
    • https://jatakusikafe.weebly.com/uploads/1/3/0/7/130776866/xakub-wimapasulor-ruwaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5ff7f97761612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/97532497181.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/22074867703.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 4776 bytes
SHA-256: b9ad91e9b2b39f01fa2e9189cfb8d6477046b9af61b0d10a02ffffc8570acb2d
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 12908 bytes
SHA-256: d6d5254ec1052e45df827998bec2051cd894a89e82f06ff13eb933e17bc830ca
font_02_sfnt_off000133ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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