Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3fe2e82c9182e1…

MALICIOUS

PDF

77.2 KB Created: 2021-06-11 01:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dcc5314676dcba6476294bd15c670bb SHA-1: e3fb403b14873e450ccfd6036cc9d6f49a3b12f7 SHA-256: af3fe2e82c9182e1cb1dc614ffa03e6d1ee600afec5232123971970c7ff5222b
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF documents. The primary malicious URL identified is a link farm designed to redirect users to potentially harmful content. The presence of a PDF SEO link farm heuristic and a high ML classifier score indicate a malicious intent, likely to manipulate search engine results or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/pbw?utm_term=what+is+anna+quindlen+claim+in+a+quilt+of+a+country
    • https://cdn-cms.f-static.net/uploads/4466664/normal_603b4475c86ac.pdf
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/topem-sokizaku.pdf
    • https://rivotajelu.weebly.com/uploads/1/3/4/3/134377742/zurumudasupotof.pdf
    • https://giruwikepu.weebly.com/uploads/1/3/4/4/134464081/69c7e205f.pdf
    • https://cdn-cms.f-static.net/uploads/4419836/normal_60298c9f05bb8.pdf
    • https://kafijojiwagovi.weebly.com/uploads/1/3/5/3/135387916/8898367.pdf
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fd67545d9aa7.pdf
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/jujigulegukezojunazi.pdf
    • https://jadomurujamum.weebly.com/uploads/1/3/5/3/135326923/3140066c4d9b44.pdf
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/4121520.pdf
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/tomexorubebali.pdf
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/tivamorulufupijepule.pdf
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/4361626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a20b751a-4ff9-49d3-b7f5-2a89b49ac0f6/when_urdu_was_born.pdf
    • https://uploads.strikinglycdn.com/files/744075a3-aad7-4d9c-9a97-c1a5e52f2a10/97104602289.pdf
    • https://uploads.strikinglycdn.com/files/351020d9-3ca3-4024-8552-c980dc3df060/2001_toyota_camry_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/66dc113c-13e6-4fd2-a2d3-625957142413/79051902701.pdf
    • https://uploads.strikinglycdn.com/files/00252bc3-70a2-4c38-b42e-7f37b10de2e2/fusugekebonawuz.pdf
    • https://uploads.strikinglycdn.com/files/5fc21caa-1666-4725-a55c-b94c32f92dc7/lay_of_luthien.pdf
    • https://uploads.strikinglycdn.com/files/add77560-4eac-4994-b3be-7ebff88b1132/schwinn_230_recumbent_bike_my20.pdf
    • https://uploads.strikinglycdn.com/files/cc6e1d76-5c0f-4df5-85b9-4d1105d26237/nexemugazik.pdf
    • https://uploads.strikinglycdn.com/files/427f5978-7cd3-465c-8c9a-26e2b10675d2/geronimo_stilton_books_online_purchase.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f084.bin
023ae2c944ef76e97138f6a50519f3552bcc96d47f2c527c3cc7eeed7f76a70f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 5500 bytes
font_01_sfnt_off00010321.bin
f582243c22f01f48778bfafe2018435e05ccc4845164e15f7903d768ee5be8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 10760 bytes

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