Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f81271170ab74c6…

MALICIOUS

PDF

76.9 KB Created: 2021-04-28 13:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3021b7871e9017d781095d8889b6efe7 SHA-1: 57c9ab56b159aa0494199d7fba0d34c41afb277b SHA-256: 6f81271170ab74c62841f197815eef3b1fce66863d343ec83c4eb4fedc711f4b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/strik?utm_term=solid+oak+study+desk+for+sale PDF link annotation
    • http://spencermcman.us/48238703111te0va.pdfIn PDF document text
    • http://ehaberdevlet.com/genie_model_gict390_battery_changeay0h9.pdfIn PDF document text
    • http://komamoj.22web.org/bariatric_surgery_guidelines_2018.pdfIn PDF document text
    • http://checkmyscore.info/clearstream_2max_indoor_outdoor_hdtv_antenna_review881d0.pdfIn PDF document text
    • http://my-credit.info/56279219521abgya.pdfIn PDF document text
    • http://rgtuitp.ru/how_to_descale_my_rowenta_ironsy5tn.pdfIn PDF document text
    • http://mylic.ru/reality_tv_show_pitch_examplexafj7.pdfIn PDF document text
    • http://timelessdecorum.com/best_chess_openings_for_white8mjt8.pdfIn PDF document text
    • http://carins.info/the_spy_paulo_coelho_movie435q5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ea585f-7414-4d83-bb74-aa6d6dd739b0/56332009796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a0384f-6a8b-464d-8af7-ad4d7a41a1f4/www_podomatic_com_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b8cc187-e0d0-4a13-a067-7c90f128b132/32815083168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37403dfe-3c90-4176-9e97-bcdf1c09866a/parts_of_speech_video_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9aa5b9f-7485-4ba3-a58f-5e74ed7f31d4/does_canon_printers_have_airprint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491363fb-4b64-45a3-879e-cf42d165ff6b/82356985074.pdfIn PDF document text
    • http://dawutanarav.epizy.com/rekajodebule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d825df6-4fed-4faf-a77d-19cccfe94ee9/letra_y_musica_del_himno_al_maestro_en_venezuela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb05d6a-7344-4ded-9e20-2c7b6253984e/nuluxiwimumoted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85cfb2b9-cfa4-4247-abb3-ca51f02250ec/best_photoshop_tutorials_on_youtube_for_beginners.pdfIn PDF document text
    • http://furofazitogo.epizy.com/morowelusemotogebupejuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca27c28-e231-4da2-9abc-5b902e5dfc9b/79616409405.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_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 5172 bytes
SHA-256: 82308dc22f0cf0afe22e603b2d33e43ec6df97f30d08fcc7a386fd2a60a46037
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 11592 bytes
SHA-256: 87b903c388a61f7f55165b451413e24219775f32282e0bf64761090b9fb8147e

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