Malicious PDF — malware analysis report

Static analysis result for SHA-256 256b2e5387c1db1b…

MALICIOUS

PDF

73.3 KB Created: 2020-11-13 02:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ab31bc821bdeb064c400f8c0e2300793 SHA-1: d69d23241a8302a758e512b52a4b7e50bf0ae608 SHA-256: 256b2e5387c1db1b9b00d8d9f019a9de07dbaeafb94ebfa93b11c69656750a93
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 0.9997

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://traffine.ru/strik?utm_term=analisis+estructural+gonzalez+cuevas PDF link annotation
    • https://jafumusatezod.weebly.com/uploads/1/3/4/4/134485233/mituda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_5f9a8a8a88156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5fa9205d164c0.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/zategafozasiru/93972972171.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/67891159464.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/47902574739.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/zafafevobisazorubixa.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/fuxig.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/conjugation_of_the_verb_to_be_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c547fc42-3f54-4279-aeec-9b66c0a600e1/92115769235.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/coordinate_grid_activities_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca6d5c6-2eb0-42e6-9ed4-d191e6f864e5/15052265240.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_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 4948 bytes
SHA-256: 89f69566cfbff6cbbb5f480bfc9833adbcba947cda31a700b981d496d592f2b6
font_01_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 11520 bytes
SHA-256: bc20fe9ae232988f8fc686c99cedabf4bbdceca76406d8e99bdc0992c34830a8
font_02_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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