Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f715507e9b2702e…

MALICIOUS

PDF

82.8 KB Created: 2021-02-26 08:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b765ab911aa90667ea03c3fb418dea71 SHA-1: 2ef50ea01ae57c451ab5a2f0ca0294f9bf35e869 SHA-256: 9f715507e9b2702e46e96303ee8c7a117db715bc1492cef3ebc3824aa3c20961
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to seemingly unrelated PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://baarspo.ru/award?keyword=why+is+my+whirlpool+refrigerator+lights+blinking, is presented as a search result for a common appliance issue, likely to trick users into clicking. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. No scripts were extracted, but the heuristic firings strongly indicate malicious intent.

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/award?keyword=why+is+my+whirlpool+refrigerator+lights+blinking PDF link annotation
    • http://mp4.design/xufuzitipofatupapipvcf6.pdfIn PDF document text
    • http://mklhhhh.space/nixanovoh3jmk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fd65c4217d71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_6016c4b45ff59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_6014703e4b2b9.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/59c0421b838e4.pdfIn PDF document text
    • http://lazadacostumercenter.com/44423993471i15d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_5fd8f275a73a7.pdfIn PDF document text
    • http://yesnutural.space/exercice_perimetre_et_aire_cercle_6eka7lo.pdfIn PDF document text
    • http://hookup666.site/que_es_cacosmiauyrl4.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/setaxilitozuko/profile._dat_dls_19_manchester_united.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/plus_size_long_formal_dresses_silver.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/bomoda.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/baby_face_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/25728716843.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/tekitujolevelawadimu.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/lowojeremeresuziz.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_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 5724 bytes
SHA-256: 098b58e425e5ce23eb24ac1f94d14c09c507d03752650567d6b5ab6c464da17c
font_01_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 10104 bytes
SHA-256: 9b203edee1938a217220caa217673331b3eb84359104cda811a9793e173ff4ab

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