Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f2070f4cd8587f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-25 12:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf2f41e51e5dac06e6e374d4740416b0 SHA-1: 730e9b297c0fc3a050b67b3860211eee00483981 SHA-256: e1f2070f4cd8587f31182080e281254a24e5ec1acc64c6f5aa7d2b3d3a632a5c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'solution stoichiometry practice problems answers', likely designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=solution+stoichiometry+practice+problems+answers PDF link annotation
    • http://reduslimitaly-official.site/xokokuluzunerafifefvwok.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/i3jiXgi/18503917908.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/ceics9k/itopride_hydrochloride_tablet.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/2OHgjhg/11301627199.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/leaf_and_flower_anatomy_worksheet_answersj7dkk.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/mvLpTig/eatme._io_mod_apk_3._8._5.pdfIn PDF document text
    • https://cdn.sqhk.co/mowukirew/ghfjaIX/leave_of_absence_letter_template_primary_school.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/hahgjgS/30671717499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_601c5e1e153dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_6009cbc56c9cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_5feecede8ba22.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/bjg4hi0/superhero_mods_for_minecraft_1._12._2.pdfIn PDF document text
    • http://bomufofo.iblogger.org/how_to_boarding_pass_spicejet.pdfIn PDF document text
    • http://50offit.pro/rajixxbh2n.pdfIn PDF document text
    • https://cdn.sqhk.co/jegetito/8iihiuF/sheffield_uni_extenuating_circumstances_form.pdfIn PDF document text
    • http://biolinkus.me/bushnell_yardage_pro_500_owners_manual9bhxh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495040/normal_5ff003d24f903.pdfIn PDF document text
    • http://theraisins.pro/watedisotafkoyk.pdfIn PDF document text
    • http://virutezofulodud.iblogger.org/kutuboguxawu.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Fii4fjf/50892534070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_600c7353e8584.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/3X5V6ij/fifa_world_cup_2022_tickets_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofanab.epizy.com/bradley_cooper_shallow_free.pdfIn PDF document text
    • http://varowok.epizy.com/howard_miller_grandfather_clocks_repair.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 5608 bytes
SHA-256: f040e25d220d7bf335c6392560414131c401c4c44e2ba0e70b34056ed547c081
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 11452 bytes
SHA-256: c8c3a84ab3d7be23b627f763011d948ae7f8b1b970e598dafc43cf3a8e59bf0f

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