Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c44d535e5ab86a…

MALICIOUS

PDF

76.0 KB Created: 2021-02-10 00:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 881da9e23f30b51f1a76e67cb7ecc88f SHA-1: 0a9eeb34872e7d76f01b2e9bbe9851c72450e598 SHA-256: 39c44d535e5ab86a842790720f56e432c286d8a5de80df0932db936695823736
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains multiple embedded URLs, one of which, 'https://bologen.ru/aws?utm_term=comparison+forms+of+modifiers+worksheet', is directly flagged as an external URI. The document body, though partially corrupted, suggests a lure related to a 'worksheet'. The presence of embedded URLs and the nature of the detection indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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://bologen.ru/aws?utm_term=comparison+forms+of+modifiers+worksheet PDF link annotation
    • http://rubka.space/world_happiness_index_report_2019brgzk.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/share_java_web_application3fio0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_5fda5679696bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_601c638eeeff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_6018789ef30f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_6012c5425804c.pdfIn PDF document text
    • http://samelike.site/688509297490k82j.pdfIn PDF document text
    • https://cdn.sqhk.co/weluwexo/hiWRzih/easy_ice_cream_recipe_no_condensed_milk.pdfIn PDF document text
    • http://likelid.xyz/453893385977msa4.pdfIn PDF document text
    • http://sodaapp.pro/68712299642nbt4m.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/firudegix/catastrophism_and_uniformitarianism_graf_1988.pdfIn PDF document text
    • http://xoxepilazif.rf.gd/baidu_free_video_er.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/types_of_aeroplane.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/forklift_safety_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/phonics_worksheets_free.pdfIn PDF document text
    • http://kaseborodemo.rf.gd/35424852543.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_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 5308 bytes
SHA-256: 3fb851055b9822493912b93156beb5551e5f7eb810345f1fa17d83b2805088e7
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 11000 bytes
SHA-256: c98b259f3b564949f14cf384bd398da4f2c553d1261f918791e8cc2bc9817fa3

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