Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f0997ee9a3737b…

MALICIOUS

PDF

83.4 KB Created: 2021-03-15 11:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 61bfee3e6f51dc8e5f68d868c51b06cb SHA-1: b00c1ac98f70944c24dfc7f2bf9ca1581e0bc795 SHA-256: 41f0997ee9a3737b1675a96a7efa6b95fff7c6ed1a9844ca820164173f381c62
126 Risk Score

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 0.9967

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://golowaki.ru/strik?utm_term=how+do+i+write+30%252F100+as+a+decimal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5fd28d555cd8f.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/bose_soundbar_universal_remote_guide.pdfIn PDF document text
    • http://rigovutamejebum.iblogger.org/juzimavufigarolebezijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6019842fc1ffb.pdfIn PDF document text
    • http://psychologyrelax.xyz/embroidery_stitches_free_bookdro7r.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/how_much_time_does_it_take_to_fall_in_love.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/where_can_i_purchase_the_book_of_enoch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_6013d81c268b0.pdfIn PDF document text
    • http://homearfes.com/dell_e6410_laptop_pricep9gph.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/golaxegifowivanidofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500883/normal_604ae8c980cc1.pdfIn PDF document text
    • http://getbuiss.online/dododinofenisofoxsc5mv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488556/normal_5fc5d2db6174a.pdfIn PDF document text
    • http://bioforce-co.site/hp_10bii_financial_calculator_how_to_useeck7h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_60157de7c7a6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_60415b67314d9.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/military_dog_training_bookj0chd.pdfIn PDF document text
    • http://com-servers.online/bosch_axxis_washing_machine_manual5p9v6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5fcc94bd49530.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/lubavexevadara.pdfIn PDF document text
    • http://pixelbarista.com/skyworth_android_tv_55_inch_revieweeii6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fc5c05866cd0.pdfIn PDF document text
    • http://freefire-gifts.com/nekamilamopve80b.pdfIn PDF document text
    • http://probmaka.tech/86444718406w4g69.pdfIn PDF document text
    • http://begdas.space/chapter_20_oxidation-_reduction_reactions_worksheet_answers1pmbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niginikixino.epizy.com/49165875297.pdfIn PDF document text
    • http://rakojumetaxo.epizy.com/how_to_write_the_appendix_of_a_business_plan.pdfIn PDF document text
    • http://jeximojela.myartsonline.com/wozid.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_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 5532 bytes
SHA-256: 4617a983c34d95912ec002199959fd4c7c3897dd4a6d9de808461bc181375464
font_01_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 11116 bytes
SHA-256: b64f8646a1c326d2d5dfef932699c513872077a4d437ec9cb6195079d1209826