Malicious PDF — malware analysis report

Static analysis result for SHA-256 39aaddab8148d1a2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-11 10:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 476b4349ea4bfbe70c04eb58c07f5d9a SHA-1: 51d0e51d19e5e1bfd1f6c11d7717cef03c1e237e SHA-256: 39aaddab8148d1a2e1f6394555a367cd6df583266303818acc4db166ff2b5da1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=need+for+speed+no+limits+mod+apk+happymod PDF link annotation
    • http://ersoil.fun/fbv_shortboard_mkii_midiikpei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_6026e5d160f6b.pdfIn PDF document text
    • http://beautysale.site/pizanijipoxizelesuresur6vmp.pdfIn PDF document text
    • http://0fruits.space/981602880603x5.pdfIn PDF document text
    • http://misstourist.info/rcbs_shotshell_reloading_manualuh7iz.pdfIn PDF document text
    • http://pochta-24.cc/spring_boot_gridfstemplate0wmmy.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/14336606142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5ff461bad36c4.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/6000602664.pdfIn PDF document text
    • http://wide-do.top/xigajijolazqv6yz.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/43730502873.pdfIn PDF document text
    • http://kernig.online/24858936475c2tfi.pdfIn PDF document text
    • http://instapriz365.online/mujiforiruldkx6.pdfIn PDF document text
    • http://bixekakazozerol.mywebcommunity.org/67418713058.pdfIn PDF document text
    • http://mamontov-net.cc/23109201546vznv4.pdfIn PDF document text
    • http://wei-nmvc.com/wirenoxipajusi7xzln.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/how_to_study_for_sat_chemistry_subject_test_reddit.pdfIn PDF document text
    • http://pixelbarista.com/sports_live_apkpurefascz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_60387188a637f.pdfIn PDF document text
    • http://importants.space/science_reading_comprehension_worksheets_5th_gradehixba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390324/normal_5fd05caf276b3.pdfIn PDF document text
    • http://beguwidip.scienceontheweb.net/65303621561.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/1702742674.pdfIn PDF document text
    • http://qwertyujg.xyz/the_lumineers_cleopatra_album_zips0zph.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_5fdea745c6920.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/gumefufuzamazidojiruzonut.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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 5416 bytes
SHA-256: 7630739f84a7e414a8ee5fca76253f30492f9668aa89f06a1feba304b1a06833
font_01_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 12452 bytes
SHA-256: e83bffdf7073f8c17f099e19624193ee27423236710cd312b7f9c3b47968c9c3

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