Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8f2ced0e60cfee…

MALICIOUS

PDF

73.2 KB Created: 2021-05-28 22:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ea76667c695bbbec9a79aeab840c1983 SHA-1: 520073211db71a242bbe47d2a3a9bdadc85c4e10 SHA-256: 3d8f2ced0e60cfee6454785417cae89d1f09595010cba7e317e011fc5b58efec
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 embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or link-farming attack. The primary malicious URL identified is https://midufefew.ru/123?utm_term=html+script+text%252F+x-+template. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting the malicious classification.

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://midufefew.ru/123?utm_term=html+script+text%252F+x-+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368246/normal_6008d27f172cd.pdfIn PDF document text
    • https://leladuginaxiwo.weebly.com/uploads/1/3/5/3/135320554/tuwuveram.pdfIn PDF document text
    • https://tumotasefon.weebly.com/uploads/1/3/5/3/135317172/2769326.pdfIn PDF document text
    • https://josojizaxa.weebly.com/uploads/1/3/5/9/135966587/somej-zufujoxeti-jugokifekilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fc8d7688f809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fe5d2215363a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_604568e043071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426688/normal_5fdd78c35adcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5ffda66ce5724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_6067e929154f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5feebdd4c1973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fe0b0dab0a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_6040397a51998.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/xefiwuz.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/e5c29cbbc1160.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/1268177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5fcc6ced20eca.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/fe77a634-d3d9-41db-9b31-c624f525c398/26983031337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59010273-4d62-4eb2-9b5a-3c874d02aeef/what_is_the_conflict_of_the_story_on_the_sidewalk_bleeding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a06d61d-0e30-4492-88d2-2ac6c201bcb9/66530880279.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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 5176 bytes
SHA-256: ffefbdb8eacf376f89d7ed6a0a804fb9eb8f848e0d77756ff73b46ca2812c49f
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 11376 bytes
SHA-256: ca9d0a2427c9f820ec6c811386a144715b835db5ee7feb5c8da2a8bf71548d09

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