Malicious PDF — malware analysis report

Static analysis result for SHA-256 c277b1540184b6d2…

MALICIOUS

PDF

84.3 KB Created: 2021-03-02 10:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 942d330483bf8f0998015187b937f07d SHA-1: 5c84f0ae73bd120801ec0e8d6128e9b08675747a SHA-256: c277b1540184b6d2e1b5d065dac88ebcebcdba8c3b54e0b7c02e06f5ef02c1b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The embedded content, though heavily obfuscated, suggests a lure related to 'calcular integral dupla online' (calculate double integral online), directing users to potentially malicious websites. The presence of external links and the nature of the heuristics strongly indicate a phishing or SEO spam campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wb?keyword=calcular%20integral%20dupla%20online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501204/normal_6004a4b4a04ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_60277288dac6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_601756720e997.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/hjjcigZ/penalty_kicks_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_600fd9150f45f.pdfIn PDF document text
    • https://borubonaxufiza.weebly.com/uploads/1/3/5/3/135318051/tuzaf-funozunibaxage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5ff8c45260d58.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/wejotusofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419851/normal_5fcc9141e8048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_600a571fe7f46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5ffd6ba75f485.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/ihpeha4/dezirijutazinopewibinij.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/oxford_english_dictionary_free_download_full_version_for_windows_8.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/jupoti/browsec_vpn_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/6438629875.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 4968 bytes
SHA-256: 86873d2ca82535dad046af8a4f3d08d288abd4cdc77d076f88c0e3b80da6a1d7
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 15048 bytes
SHA-256: 27599a893a875ba31ec6b2b4a5bca197bf992df77ead5da04ff9dc6d30d40bd9
font_02_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 16156 bytes
SHA-256: 3f6a4885807800c61ce4e539377b62b4061096f2f188beb2758bb70ff15ef45e
font_03_sfnt_off00013427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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