Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60f4682dc59a4e9…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 08:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf419f684a5b09dc950da0a7f3820676 SHA-1: b13227719af46d92841ba451062394c952a8b7cf SHA-256: e60f4682dc59a4e9072bba82de58e5481d51e8ee89aa0028389bfd03ea21acb8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains an embedded URI pointing to a suspicious domain, resalured.ru, which is likely used to host a phishing page or distribute further malware. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://resalured.ru/wix?keyword=short+story+analysis+worksheet+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463002/normal_6038ee48ae2c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6047edafa1ca2.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/how_fast_does_a_49cc_taotao_scooter_gowhgbp.pdfIn PDF document text
    • http://cetakchantek.com/57302811476lt68t.pdfIn PDF document text
    • http://stnold.com/anti_deep_freeze_7.51.020wid72.pdfIn PDF document text
    • http://sportplays.ru/shark_euro_pro_sewing_machine_reviewsal3x4.pdfIn PDF document text
    • http://wugafis.66ghz.com/phrasal_verbs_definition_in_english.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/skip_the_dishes_app_apku7hh3.pdfIn PDF document text
    • http://3bki.ru/beats_solo_3_wireless_rose_gold_jb_hi_fiy9ogz.pdfIn PDF document text
    • http://wordwild-store.com/how_to_pressure_cook_on_instant_pot_duo_novahfdc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461761/normal_5fdec9114f6e1.pdfIn PDF document text
    • http://sanadewa.iblogger.org/how_to_apply_design_principles.pdfIn PDF document text
    • http://new-leggins.site/what_does_it_mean_to_dream_of_someone_pregnant_with_twins5bmkq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buxazub.epizy.com/68224343782.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/letter_tracing_worksheet_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/sedidozade.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/sample_case_study_report_in_social_work.pdfIn PDF document text
    • http://temomij.epizy.com/24053608156.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/14112714020.pdfIn PDF document text
    • http://ramejepazino.rf.gd/believer_song_tamil_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/52897743576.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_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 5424 bytes
SHA-256: 8b79f57c9af346a399fa0ab8dfbeb8d21772cd4602ed796e1c50cfb994ff73ee
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 10704 bytes
SHA-256: e795c7113ea7f6e4d56b2acc75624863ff6aede114e832c39f51c6d41f8a68bf

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