Malicious PDF — malware analysis report

Static analysis result for SHA-256 09549b1e9bd766fd…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 08:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 16704cabff483268ff742eb90ac10c64 SHA-1: 7bf363dd4e379c65d2e04419eec41db9ebb431e9 SHA-256: 09549b1e9bd766fdd1b4df665ce64223830ef6ea58374c45186e5a3afdad815b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://gimoguvi.ru/strik?utm_term=how+to+replace+a+primer+bulb', likely lead to malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm heuristics strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/strik?utm_term=how+to+replace+a+primer+bulb PDF link annotation
    • https://cdn.sqhk.co/xogedusov/heggfVf/counted_cross_stitch_ornament_patterns.pdfIn PDF document text
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/mipemala-vodatonusejova.pdfIn PDF document text
    • http://hightrade.club/fimipikisaxijejqb7rr.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/vamamukuloru-pawulobasun-fekavu-gulariromivis.pdfIn PDF document text
    • http://termo-nord.tech/how_to_make_simple_syrup_for_chocolate_cakei1h2p.pdfIn PDF document text
    • http://matroskin.space/bopizanvtae9.pdfIn PDF document text
    • https://netewubo.weebly.com/uploads/1/3/4/3/134325031/7607925.pdfIn PDF document text
    • https://toxozuduz.weebly.com/uploads/1/3/5/2/135295771/kesenule.pdfIn PDF document text
    • https://cdn.sqhk.co/lilokimoz/gdwo2ib/56188608490.pdfIn PDF document text
    • http://iminn.ru/pumuboguroduvukexonadujpwvwu.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/ljfNFfl/papabekoluta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_ef883128eb944e208e5588afdbcec343.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/382da582-dab8-496b-9512-478b45433ceb/8273965731.pdfIn PDF document text
    • http://menenig.rf.gd/whats_coming_to_netflix_in_may_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9e8af2-ce21-4fe9-b3a1-5348bcd673c2/sperm_wars_book_review.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_4db41ea4a92a485bbf70e9971aabdc2d.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_7090ddf741ee4040ad5d9b4b76bd49ee.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_ece8521967f6422eb6b044e4a54915de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c1d795-9c44-4be8-8b28-e8c5bb4a94b6/96657275894.pdfIn PDF document text
    • http://fozufafetad.epizy.com/active_and_passive_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/348da58e-45cc-4c05-afa6-d1d596f913d2/33035683247.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_4a727797bb3b45519bd93fcd8ca5f597.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc19faa1-5bd9-4c53-a08f-961eccc693ae/33938901532.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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5096 bytes
SHA-256: 4017d82afe41c745ffba7e0f89dd641de96adb44541962dd8edcfc99504b8ace
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 10128 bytes
SHA-256: 850068f2828a9e406fe8babce1efa2385dbf1708b43140d81e998b468764c969