Malicious PDF — malware analysis report

Static analysis result for SHA-256 461a8f74d7fd6862…

MALICIOUS

PDF

76.5 KB Created: 2021-05-22 12:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 006dcff4abafbfbe2113d2c64d041fb5 SHA-1: 926c09b61375abdd8a1b02264943ad9d5c185d9f SHA-256: 461a8f74d7fd68622bde5343d208f67cd00e940f0f21fcb888e96466cbcea17c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, forming a link farm, likely intended to direct users to malicious content or phishing sites. The presence of numerous PDF links suggests an attempt to obscure the true malicious destination or to distribute further malicious documents.

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://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/figuzijirovej.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_600a74a458dae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374368/normal_5fe4340f1b067.pdfIn PDF document text
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/9142401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_605bc377e7d54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413240/normal_5fee3fffdef22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_5fd2a3c6d7467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=celestron%2080azs%20reviewPDF link annotation
    • https://uploads.strikinglycdn.com/files/e2fe95f3-b66a-43ea-8e41-5d681ea9ffc6/mudopemapuwopiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019064ec-0dfb-41ba-83cb-4dceaac10cd7/lenazidekizumo.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/74284849705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74e23c5-3195-4d89-98e8-d9ab36651b71/gejilo.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/mugubabapafuvebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91545c7-59c6-41ff-ac4c-b8a6f22a5d06/mossberg_500_turkey_deer_combo_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f9dc7e-fb46-4c1a-bf96-af7e5d8b0905/what_is_the_best_concordance_of_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/hunter_xcore_sprinkler_manual.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_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 5124 bytes
SHA-256: 0e6623d23b3b3d3a6e3a6a28415a196f8c7b7d620ce92a659c911262b1358bc2
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10852 bytes
SHA-256: 1e3128bad5b847b2bd4df5439f6c7c264d058bcd1d5658cb7aa5010f36396f1d

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