Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f6f8a719694a47…

MALICIOUS

PDF

67.6 KB Created: 2020-11-29 11:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6d4e6fedc3a45397559cd2378313ece7 SHA-1: 27b4b43c06021bf467ac8eab1113645caecb52c9 SHA-256: e4f6f8a719694a476627e1d05504fa661fd7bcc173135d3e105e27ffffdcd88f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=the+pearl+chapter+3+study+guide+answers PDF link annotation
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/6de43.pdfIn PDF document text
    • https://waxusebodik.weebly.com/uploads/1/3/4/5/134529962/wagotezaki_romugu.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/9363050.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/9505996.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/jelub.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/1073556.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/de3ca8e7-f4f8-4af3-84dd-28e5044f74fa/thermal_physics_schroeder_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb12f4dd-9855-4dae-ba3b-66299af5121e/fox_run_mall_store_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4234e1bc-6ec5-45e1-a05f-36384e0c473c/dakujiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bd1f53-f23c-4ff9-81b2-8ad59d9d96ac/become_a_living_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ec27a1-db3b-4c67-87da-40d75b405280/9755426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266f229a-ec99-4636-b3dc-d997c8c20967/baradepawemosew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c47663-b6aa-4af3-9153-0250996011cb/zutubowogifib.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_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 5644 bytes
SHA-256: 5e2e0736732d8ff275c89b8231f5991763aa75c6798a84222a69c44549df1422
font_01_sfnt_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 9668 bytes
SHA-256: 7fb910aef12bb244ad63fa6826e4a72f4ff5c29fdfbf6ff8152ba4662e7e2ff4

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