Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f9902550ee207f…

MALICIOUS

PDF

78.3 KB Created: 2021-02-21 07:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a6fa9a0319ba4b58d7d2bb477d60ed7c SHA-1: fe58a5f9c4cd822e72c2a54e2d795c76f291f19e SHA-256: 68f9902550ee207f09ba1ec62ccfb734cef2c0e0dd1854deaceec0e409a7f58c
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains a link to known malicious redirector infrastructure. The embedded URL `https://yafferge.ru/wix?keyword=ip+addressing+and+subnetting+workbook+answers` is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of malicious links and the overall detection profile strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wix?keyword=ip+addressing+and+subnetting+workbook+answers In PDF document text
    • https://cdn.sqhk.co/zogobadakedu/9jbthgH/75208938680.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/bC2Uyji/parachute_chicago_bedding.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379355/normal_5ffb4fa561ef9.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/hIzuPhg/the_importance_of_overcoming_obstacles_in_life_essay.pdfIn PDF document text
    • http://job-finder.space/binder_cover_sheet_template_word7js7h.pdfIn PDF document text
    • http://minozodatatinad.22web.org/husqvarna_hu775h_spark_plug_gap.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/NjhByZZ/water_slide_repair_game_download.pdfIn PDF document text
    • http://differencecheats.net/atomic_emission_spectroscopy_pre_lab_answersolxsi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379601/normal_5fde74cf297a4.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/824464336050vb1v.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/fhghhgg/71004399150.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/lurutopobi/subject_and_verb_agreement_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/yuzu_emulator_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/25011793595.pdfIn PDF document text
    • http://nigowona.rf.gd/32487620112.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/chargers_injury_report_nfl.pdfIn PDF document text
    • http://widevuwototavu.rf.gd/47209478501.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/wewuxubalixara.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/bladestorm_nightmare_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/7242878940.pdfIn PDF document text
    • http://widitedofirok.rf.gd/ximopifufe.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/karvy_mutual_fund_forms.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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5212 bytes
SHA-256: e41c78112b6b133c067b4fa9577fd7aa8942c90e7a53fc10a561f825d87782cb
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 10120 bytes
SHA-256: fc9f3e45563633f36f51b906453404881c03a4cdb93c5f1039c6087ca45b2210
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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