Malicious PDF — malware analysis report

Static analysis result for SHA-256 18771ade17d39308…

MALICIOUS

PDF

74.0 KB Created: 2020-11-13 06:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b6c6c76e0d2f484b9d8bfbc49e41a10a SHA-1: 9c900461d3b87afaf734ffd320ac72e74f6ad5fc SHA-256: 18771ade17d39308a97232fe81135245e0888228c67b95adeab4311b4d1cd3bc
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 0.9997

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://traffine.ru/123?utm_term=john+locke+impact+on+psychology PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f951a6c56deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_5faa28af0c4b5.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/87b1292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5f9745754dadd.pdfIn PDF document text
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/7805721.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/7691706.pdfIn PDF document text
    • https://kogavoduwesexup.weebly.com/uploads/1/3/4/6/134600755/86b78be8410e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_5f9f2e0f2c51d.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/wukara/57291902977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c13333-ac42-4083-a4f8-945fdce4b6fc/73315063721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8e022c-20f8-449a-89c5-2bc9fc13275f/minecraft_mod_1.5.2.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/guvutojijozibamive.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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 5196 bytes
SHA-256: cdefa58f8ef8988a4ad90699116255828924e04d732d98e62bfe67a876a91a91
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 9804 bytes
SHA-256: 2b29eaba54fd6786dd7baa0cdc6ba4e5c18cd3aaaf33251bbd3ca0c9601f7402
font_02_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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