Malicious PDF — malware analysis report

Static analysis result for SHA-256 93480a1d75a6c9d6…

MALICIOUS

PDF

87.6 KB Created: 2021-02-17 04:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bece982f816bd6b432cc1e058c8550b9 SHA-1: b839d03c88133f556dfdb75dfc816e9b2486e42e SHA-256: 93480a1d75a6c9d613d75b6cb7934a52a0dc96911f8796b53f5b36cf40cd3c73
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a callback phishing lure. It contains numerous external URIs, with one pointing to a suspicious domain (jottigo.ru) that is likely part of a campaign to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving social engineering to elicit a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jottigo.ru/strik?utm_term=old+school+runescape+grand+exchange+api PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5fc5d8c245137.pdfIn PDF document text
    • http://lukokiwo.iblogger.org/62090992954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5fda08d3c8357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_600504a3aab7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5ff43a27e30fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fe9f311aab39.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/ximajenibejokad14y4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449410/normal_5ff608707f9e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_6005d8c11a8bf.pdfIn PDF document text
    • http://scandisvet.ru/xepexavign70o.pdfIn PDF document text
    • http://thrivewebs.com/hex_head_screw_dimensionsntk29.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/nigimul/android_progress_bar_animation.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/ap_7522_user_manual.pdfIn PDF document text
    • http://leriwegozeko.epizy.com/58938557440.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/esl_personal_pronouns_worksheet.pdfIn PDF document text
    • http://zovixis.epizy.com/28638266368.pdfIn PDF document text
    • http://desakoda.rf.gd/chow_mein_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/48136278998.pdfIn PDF document text
    • http://vawelinixafapi.epizy.com/34952289073.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/savavugaxisigalexamo.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/lic_agent_confidential_report_form.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_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 5432 bytes
SHA-256: 2e759db4847e7d31be15b5c5488e6096c9d8f90563f2990bc6e49f1e43eaaab0
font_01_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 13048 bytes
SHA-256: b4446bbcbc002858a82ffc71021134b166a629de811ed0f80b1c36f7890e78cb

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