Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a91776327bacf9c…

MALICIOUS

PDF

86.1 KB Created: 2021-03-13 15:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 061b5c7513b00a563b7be868c98df583 SHA-1: 659cfb799d302cc2e551dacda227277839ea1989 SHA-256: 6a91776327bacf9c824547f6530db7c6943a7b0b7d734f58f1ccd32fde602050
126 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to potentially malicious sites, disguised as a help article. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=why+is+my+hp+envy+printer+not+printing+in+color PDF link annotation
    • http://7lessons.site/zawelawanofajukesjfppl.pdfIn PDF document text
    • http://naturalik.fun/your_guide_tv_bendigoyuo43.pdfIn PDF document text
    • http://clubstore.info/jutukopizopupukd7rzb.pdfIn PDF document text
    • http://tepuragebu.iblogger.org/16569288340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_602d4bab59f33.pdfIn PDF document text
    • http://sipoxamux.22web.org/voletonezofulafid.pdfIn PDF document text
    • http://ozalupa.space/ritual_para_virar_uma_vampirap7lzw.pdfIn PDF document text
    • http://detonic-hypertonie.website/16839523490z7yjp.pdfIn PDF document text
    • http://grenkasalo4.xyz/all_blues_transcriptionedm6d.pdfIn PDF document text
    • http://vkrowl.com/what_does_uber_use_python_forf3iri.pdfIn PDF document text
    • http://arenaprobet.com/navutikexibegozitennges9.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/how_do_i_contact_samsung_tech_supportd3k6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5fc959171e71f.pdfIn PDF document text
    • http://vovpomnim.ru/how_to_turn_off_a_brinks_alarm_systemz3ecb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385880/normal_5fefaa3a97685.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/xowasosuf/xesim.pdfIn PDF document text
    • http://wagadepepixapu.epizy.com/identifying_nouns_worksheets_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/auld_lang_syne_means_in_english.pdfIn PDF document text
    • http://wafitiw.epizy.com/housing_loan_emi_calculator_excel_sheet.pdfIn PDF document text
    • http://fububosuvakosal.epizy.com/spelling_test_template_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a88c069-d12d-49b0-a3c4-a2ec3d7f0097/15709012900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b607f4b7-05f2-4a07-b026-8240ebf5c568/zaxev.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_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 5312 bytes
SHA-256: b69b80d8fd42aa0a06c99dd549fb5816b9960ea523d92e0300c532027ac959ad
font_01_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 11196 bytes
SHA-256: 5f4208ea6c7e625a179f57eba5d467cb4e93decf4dd4f99ba3e24e216142fb1c

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