Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7226d623756c10…

MALICIOUS

PDF

78.1 KB Created: 2021-02-16 21:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6132c8f34adf40dcb04047bb2c95a5f4 SHA-1: 57ca5002120f3a4c4eee6d99e47cf6f04726020f SHA-256: 3c7226d623756c1066b809196fa268fb7ff00ce0eb8e58df70ebcaaa90bbe73d
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 0.9998

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://bologen.ru/strik?utm_term=do+brain+tumors+make+you+angry PDF link annotation
    • https://cdn.sqhk.co/salijuvam/ghjojap/feasibility_study_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/eQgcqjc/xiraku.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/jokalasufibax.pdfIn PDF document text
    • https://soresewo.weebly.com/uploads/1/3/1/0/131069968/69061de052.pdfIn PDF document text
    • http://lizetadolanut.iblogger.org/40569015548.pdfIn PDF document text
    • https://wijugiretatito.weebly.com/uploads/1/3/2/8/132814958/koxewizoxetason.pdfIn PDF document text
    • https://gabonavokelog.weebly.com/uploads/1/3/4/6/134684269/8678304.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/0c2ccd31380c9e.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/jjCjblg/sokomoverurukolebabewepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff4db3f9f406.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/votawawo/goku_vs_android_20_full_fight.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/balance_sheet_sample_word.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/77314650271.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/seismic_wave_propagation.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_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 5280 bytes
SHA-256: a42f06111e0273490eccef6fdb7da623daec2c11fb4943d16d901d9291e37435
font_01_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 10120 bytes
SHA-256: ff0b5837c905f1e06bba62d6cb14b7f478857ebc6b65d41c40a938f1e3ee42d1

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