Malicious PDF — malware analysis report

Static analysis result for SHA-256 607dc01fdc013cf1…

MALICIOUS

PDF

63.1 KB Created: 2021-02-13 05:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b5c7958e4c6e49d6a4860796f9bed959 SHA-1: 8bc61804e9ec42d1d8c253b35e4cfc9521c125ce SHA-256: 607dc01fdc013cf177bdae7991317ade19a8bc36d20d29167f93596533378d68
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'baarspo.ru', suggesting it's designed to redirect users to a potentially harmful website. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://baarspo.ru/wb?keyword=describing%20enlargement%20worksheet%20tes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453764/normal_5fdbc75f47cbe.pdfIn PDF document text
    • http://nakrutkavk.site/verasepusiravawukimikiudzq7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_6015167721a2b.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/ggplO5O/83603718544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_60055636e91f9.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/hciiaje/sufaxepufok.pdfIn PDF document text
    • http://artistichomesolutions.com/72708344837ll7ey.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/soigOWl/luvuvoxos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_601884d988f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fe8d6d51bd9b.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/jfMdjio/siren_sound_effect_dj_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/lhebEib/elder_scrolls_skyrim_healing_potion_recipe.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/wovitiku/luzexos.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/pifarijerusazomesosujo.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/87955302614.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_off0000bb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB31 5508 bytes
SHA-256: b42ee0151870dc3a74bebcae5536bccc7c09e92a9f42358af8ee92a696a1f9e9
font_01_sfnt_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 9812 bytes
SHA-256: 352b2fb439a0c207cb7056f9cf65867310a789d7244374445277329c9e3bfe34