Malicious PDF — malware analysis report

Static analysis result for SHA-256 861fba59727eaf66…

MALICIOUS

PDF

76.9 KB Created: 2021-03-24 23:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c388436852fa5e83df400d231684d656 SHA-1: 07caddfea01c5921f3251b22cb67be6d3fea7b0f SHA-256: 861fba59727eaf6665ad00c7b7170868417fd9be47923b2c6c782d76fdda3aff
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('midufefew.ru'), suggesting a phishing or malware distribution scheme. The PDF structure itself is also identified as a link farm on disposable hosting, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://midufefew.ru/wix?keyword=adios+america+pdf PDF link annotation
    • https://cdn.sqhk.co/sosexazefip/googhhg/zokefazozakigemidemogiko.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/hggjggc/67381974991.pdfIn PDF document text
    • http://lnstagramverifycentre.com/93365161965mkawz.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/jfhdP1i/super_cat_shooter_unblocked.pdfIn PDF document text
    • http://totakonepis.iblogger.org/10_most_important_events_in_us_history_timeline.pdfIn PDF document text
    • http://nivawegokex.22web.org/keseganiworuvu.pdfIn PDF document text
    • http://xudisoda.66ghz.com/word_origin_worksheets_5th_grade.pdfIn PDF document text
    • http://moreprodukti.com/663400673619q2fx.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/hhhrDjT/gorukidifepugojeno.pdfIn PDF document text
    • http://xefibusutama.22web.org/sanyo_fwzv475f_dvd_recorder_vcr_combo_for_sale.pdfIn PDF document text
    • http://samo-katim.ru/wemodozilufemuzoxetuxrg979.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/dhjjdid/english_to_spanish_translation_services_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_1e54f73fd96645449ba5596d2ed2629e.pdf?index=trueIn PDF document text
    • http://wedinuvudazoxo.rf.gd/pathfinder_first_world_adventure.pdfIn PDF document text
    • http://wirokafimuda.epizy.com/10496796286.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_e49a3eeca6d64091892ef87acb173f5c.pdf?index=trueIn PDF document text
    • http://zepitomus.rf.gd/74197762544.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_f81788d7dd7f43d69c166634ec7c36bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc75404-68f2-4ff4-bb7e-77d8573c7178/spanish_verb_conjugation_worksheets.pdfIn PDF document text
    • http://tedusulowo.rf.gd/hernia_inguinal_tratamento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698363ce-e99a-4042-b63a-a8b3db7542b4/vevofazakewanatajegab.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_8863ebef44d24a77955d114a85018e54.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_d8f1882f895c4c539f1b888b20d91d74.pdf?index=trueIn 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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5260 bytes
SHA-256: 5d292f3a4adac8cca06757090d2819beac9f25ef8218897cd956a986a1f61162
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 11100 bytes
SHA-256: cc98fb90902a00aa6bea3e4912eea63862afe0a1c919e062722eb32691e74215

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