Malicious PDF — malware analysis report

Static analysis result for SHA-256 537570f3e77da9b8…

MALICIOUS

PDF

78.4 KB Created: 2021-04-20 12:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 17d8827629d54d1ac7b37763ae9fd4e4 SHA-1: 69b4c7631fe362264f73023ca243b0491656ca01 SHA-256: 537570f3e77da9b827e06fc42d37f0b546b1d4e0cfb9f2ff8b901fefcb42605e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://jottigo.ru/strik?utm_term=types+of+chemical+bonds+worksheet+chemistry+if8766', is directly embedded and likely serves as the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the extensive link farm suggests a drive-by download or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=types+of+chemical+bonds+worksheet+chemistry+if8766 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5fc7382a445f2.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463529/normal_5ffb1cdcaae4d.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/fimekevivatuv.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/4007194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_5fe6510fd3dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_5fd61bcc7685c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_60585e228a6fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5fd17d6424b64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_6046543aca778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fe7883e8abbe.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/1203180.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/sogitem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zalomi/9296510140.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/65319862141.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/98649357953.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/65171539598.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/third_conditional_explanation.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/2123248064.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/sibikotipufoxoxari.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/bazosavoxotawosefa.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/3471573195.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/tefabimonogopomobame.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 5956 bytes
SHA-256: e04d833183f265482326a7d57fa03121e474c8f67b8e622cd79ab829f1e830da
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 10552 bytes
SHA-256: 0751d49963281d5d44ee308a373aa6724ca9a0263fc216f349441e0b6f1c07a5
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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