Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ea16447fbaebaf…

MALICIOUS

PDF

75.7 KB Created: 2021-04-18 10:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2b8540f2f0aa85cc93cf8f5d3840a0d0 SHA-1: 2289c833482d87d2fff07e3119d849eb6a14901d SHA-256: 78ea16447fbaebaf275d8468936a3a6b51c77a26ca748126d3709b0c2e06b657
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URL pointing to 'fokemale.ru', which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, contains keywords related to 'Armstrong furnace parts', suggesting a lure to trick users into visiting the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=armstrong+furnace+parts PDF link annotation
    • https://puvugopusu.weebly.com/uploads/1/3/2/7/132711965/0dd6ade37ef63.pdfIn PDF document text
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/pitarudusone.pdfIn PDF document text
    • https://bupitubijas.weebly.com/uploads/1/3/4/0/134040922/633ad9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5fc836e8ad2cd.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/egjghge/are_you_learning_spanish_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/9Qptage/is_replika_pro_worth_it_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_603582ae3ff81.pdfIn PDF document text
    • https://kodirovotosin.weebly.com/uploads/1/3/2/8/132814250/nunuroxoxuponiwagamu.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/loranoduzuja/53084960626.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/android_bitmap_fill_imageview.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/56561285432.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/2020_acer_nitro_5_15.6_fhd_gaming_laptop_computer.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_ee88435e0c5e40cc92317c1f80e10f4b.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_ac58d576087242b7a4390da6079183b2.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_20fbacce7d1142318847b2328a881100.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/28734357919.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/cfd_software_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/13096615932.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_c8712fa673054459b0d5402ef3dc0878.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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 5292 bytes
SHA-256: 70f7a0256d31d69115dad12fa171560bd5ecbded54276bebb9cc4628af551c9c
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 11220 bytes
SHA-256: 7533b9d139929042294dd8efab04b802be5cfd2ccb2d34ffb74b3c4686a7856e

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