Malicious PDF — malware analysis report

Static analysis result for SHA-256 b405bdd1bf843b6b…

MALICIOUS

PDF

89.0 KB Created: 2021-05-28 05:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e105e109510b0be49b854c69d8d1560e SHA-1: df648e74fd1c8c767ce575a33246fef21d6767f1 SHA-256: b405bdd1bf843b6b26678ef8ed6039e67fd4ca9766f221226f0268d82455d544
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=space+wolves+8th+edition+codex+pdf+vk PDF link annotation
    • https://zobaretax.weebly.com/uploads/1/3/1/4/131482953/1579999.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/1a625dec08d337.pdfIn PDF document text
    • https://vipunufevewe.weebly.com/uploads/1/3/0/8/130874016/550744.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/b3225d86c.pdfIn PDF document text
    • https://nozigofomin.weebly.com/uploads/1/3/4/4/134481739/tenubup-rotalip.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/3274274.pdfIn PDF document text
    • https://kimexigute.weebly.com/uploads/1/3/4/0/134017587/7846535.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/favavufisom.pdfIn PDF document text
    • https://birifisak.weebly.com/uploads/1/3/4/4/134493055/8698858.pdfIn PDF document text
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/1cec195f55f26fb.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/3fdfc207-5552-4b26-8a4f-72f0f9a4de5c/81229448056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6081d4a0-a10b-4124-97f5-df0b289f3e6f/74511146034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce5f271-4c2f-4baf-9a9a-8702fb64860c/how_to_calculate_sat_math_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49983937-b949-45d7-acc0-af6a2c7b3851/zajupenefuvaximuvefera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab72e91c-3a4c-4bd8-b905-8a7fa770057a/titilumajesuraxasenek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeccb92c-2b31-4b8e-862e-38da6c704114/22898796873.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 5728 bytes
SHA-256: 169c612e25014180d8bd6acd267f9ba1b9b8930e9d461e5756931dd8aadbe9a8
font_01_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 11164 bytes
SHA-256: 1de8aa2d3e91728707a94869ee77c984c480abf7469e69ce82a15b8091d604fb

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