Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa56d4f3eca98a83…

MALICIOUS

PDF

79.2 KB Created: 2021-03-19 19:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3d15f84a333d935548a4375d1be6ff8 SHA-1: 8bc56a6544c330e324ca91bf0042721606b4b61b SHA-256: aa56d4f3eca98a83c0302bf5d52f26a3c5cc7177901e63d4b5767ac9d4f8b5da
186 Risk Score

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 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://dugedepap.ru/strik?utm_term=how+much+does+a+70+inch+led+tv+weight PDF link annotation
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/cd49d3088e1b.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/83pijdy/67922928349.pdfIn PDF document text
    • https://paxuxitusokewu.weebly.com/uploads/1/3/1/3/131380341/nilubi-daxezo-jajiso.pdfIn PDF document text
    • https://fubuworarakej.weebly.com/uploads/1/3/4/1/134108970/8265214.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/eigD9OR/xudono.pdfIn PDF document text
    • https://cdn.sqhk.co/bafujifi/CgiLUie/20849814345.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/hvdid19/63584919194.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ERTtieM/56232114497.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/hgpEjiT/tunevukusilagimomez.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/3793912.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/WQHcjbl/zudajiwanuveginup.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/zijupovukezupi-besisisukomab-kulosibasaluz-bajolofofezojer.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/jeCu2RT/55150089824.pdfIn PDF document text
    • https://cdn.sqhk.co/tikikizeveni/gd95Fhg/77074701346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/dawipifew.pdfIn PDF document text
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_c2d5ab79fb1d4fa290ddb869eb3b3a4c.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_5e485591b1e64802a4225d3c25f2b7cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/38338886255.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_94b25a64828e49599ee7de32a2356d11.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_268d34edfe31408fa72b3c5f04ffd862.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/68233358395.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_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 5592 bytes
SHA-256: e36ec23565413f2f08db2c6c55d49c94fe81d813e9d9dee644c6a0ceb212e726
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 11104 bytes
SHA-256: b333065248d54ecd57ea12fc2d051a7b620b4bfdaeea87a294926ed6a253cd48

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