Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4e587234663b61…

MALICIOUS

PDF

79.8 KB Created: 2021-06-06 07:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: be5e802fd90ae111ddc45d1d5f388452 SHA-1: 957c7c6bb9a0574fc94070b331dbe4f210687956 SHA-256: ff4e587234663b61f9ea7344a3fc7ee9dff85cfd701e21f16201175eae39d84b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a fake CAPTCHA heuristic suggests a social engineering tactic to trick users into performing an action. The document also contains numerous external links, with one pointing to a URL associated with downloading an application, further supporting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/pbw?utm_term=download+truecaller+premium+apk+latest+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5fdb77f07ef56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483586/normal_5fca7bbff0925.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444852/normal_5fec4264e6b7c.pdfIn PDF document text
    • https://devubavoxonor.weebly.com/uploads/1/3/2/7/132741482/b07e2a4d971a0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4402956/normal_60b7924096330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_60ba9cf01d3e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_60460752a2011.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/fonosatesos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_60012c5007ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367633/normal_5fdf7d36dc762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_603caa5db6764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_606238d71eb8d.pdfIn PDF document text
    • https://bisomimimuj.weebly.com/uploads/1/3/4/5/134526732/defejotab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_605b8d54b8ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_600a18a34740e.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://uploads.strikinglycdn.com/files/35562897-0a19-44ad-9091-7bb208d0da6a/wireless_communication_technology_cellular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de398d4-1a99-49c8-a930-6bae5ef7eaab/is_skim_milk_21_day_fix_approved.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 5316 bytes
SHA-256: 16a8ed56d0fc33aee1fa65dfa9faca89c39ec74f481b0d3b486a5941bca27989
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 11112 bytes
SHA-256: c598609744df226db287df704ebff884a0881fdd8556c656b144f13624c4a310
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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