Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5211d983206abe0…

MALICIOUS

PDF

68.2 KB Created: 2020-11-23 07:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 90df0f0c0c6c8017f9e242ea161a80a2 SHA-1: 969551c94580396c57fd7c095da3b75db50564e8 SHA-256: f5211d983206abe010fbb1dde7693d6f3caed3fb533c62f6e4e2c87d85d4be36
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-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://trafffi.ru/aws?utm_term=languidecer+qu%25C3%25A9+es PDF link annotation
    • https://dutedurelixuvu.weebly.com/uploads/1/3/4/3/134320021/9372343.pdfIn PDF document text
    • https://jabanomazekapuf.weebly.com/uploads/1/3/4/7/134743752/1391192.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/63480aea38bb9.pdfIn PDF document text
    • https://tenigirexono.weebly.com/uploads/1/3/4/6/134645883/monevumibem_tozadovivedilu.pdfIn PDF document text
    • https://lefigokilafelu.weebly.com/uploads/1/3/4/7/134714095/7119970.pdfIn PDF document text
    • https://rinalodejivew.weebly.com/uploads/1/3/4/3/134383373/5663396.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/457ce5f3-d597-4ce6-b776-bae9fdbcecdf/gibavefegugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c44b0c6-0e9c-410c-9e48-e7b84eb9a747/hose_guides_cast_iron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa153153-3fd2-456a-bd46-487b369bd8e9/66426220155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edef2c26-ad50-43c9-a7da-2033d455c9a9/79754484678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26476b68-bc2a-4bcd-868e-3cf6ebf5eb03/2985814558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732b78fb-07ee-4513-8d6f-7446f4eb66c3/applied_predictive_modeling_max_kuhn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f00be0f-f9d2-4c2a-b365-c75bb622fde9/31682012228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c27ab9f-5fc8-45ee-9673-576e1deaa932/battle_of_olympus_nes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f147b3-f6f5-4652-bd37-376de719db05/29622828353.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_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 5284 bytes
SHA-256: efbbaf073db8049b17153282a1c68f635c6bf30758995279e1bfd2afe3ccb919
font_01_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 11356 bytes
SHA-256: a08949ce1b18b79ac85b84a4aa5861ca34bc2d0571e9c4a8358914900022b602

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