Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af1b0ed46976777…

MALICIOUS

PDF

123.2 KB Created: 2021-03-24 05:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d407e1068cc1109977205e60c269f3c3 SHA-1: 46d2c3383885d30e26edd7bc41b49580b54228e2 SHA-256: 4af1b0ed469767777d6f4074ca6df26ff8d6411aef7b63501abe9ed02ff742ca
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://baarspo.ru/strik?utm_term=where+do+the+navajo+live+now', is flagged as suspicious and likely leads to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

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://baarspo.ru/strik?utm_term=where+do+the+navajo+live+now PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465402/normal_60385d6d65414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_60461132cf378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_604fc8bbc5e01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5ff713567806a.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/hcjdomi/bloomsburg_university_of_pennsylvania_acceptance_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/RQjbjdB/infectious_agent_detection_by_nucleic_acid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388178/normal_5fc8362535b5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd651e38f6a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fe4a6d59e480.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/jivamubug/gejala_pneumonia_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/zojowurasabexiwobokovodag.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/35769973647.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/easyanticheat_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/final_fantasy_xvi_clive.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_fd12e7ae8db84c87bb7418338a7562ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/beyblade_metal_fusion_games.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/koxejidiju.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/movixukefusiveg.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_5b2129c25909477f92ec73d000fee4f8.pdf?index=trueIn 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_off0001a211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A211 4976 bytes
SHA-256: 0c72dfd30fd8a512abc9084fc67c42ace91495da3c925a4ddbc23c28f89e46c8
font_01_sfnt_off0001b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B314 13568 bytes
SHA-256: fc116f5aea78157eb16ee5a06f763411a8baa68bdffef985d2be974f29bfc513

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