Malicious PDF — malware analysis report

Static analysis result for SHA-256 685f84f2e6007403…

MALICIOUS

PDF

77.9 KB Created: 2021-03-12 15:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b7a9fdec2e82516542457d5f5546820c SHA-1: 9d3be0fb1bb2ae939c543753376132b9b42349d0 SHA-256: 685f84f2e60074037dc4a7a83ff51746ec682b614d648dd877e8bda3e5476df7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism to deliver malicious content. The document body, though heavily obfuscated, contains text related to 'scheme for igneous rock identification answers', likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=scheme+for+igneous+rock+identification+answers PDF link annotation
    • http://okrasote.info/linemans_and_cablemans_handbook_eleventh_editiontp06x.pdfIn PDF document text
    • http://ottics.ru/janezitobewesapiitr6.pdfIn PDF document text
    • http://mesretly.xyz/how_to_install_britax_marathon_forward_facing_with_seat_beltcjtk4.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/b583c4717171e.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/what_is_the_5_love_languages_test.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/pdf_splitter_free_download_filehippo.pdfIn PDF document text
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/mawefupudunuf_gewolijal_malowone_bozod.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/jc3WXcY/51797070245.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/animation_software_free_for_windowsnbd1q.pdfIn PDF document text
    • http://esplus.pro/samsung_xpress_c460w_driver_windows_737j5r.pdfIn PDF document text
    • http://matimomewojime.mypressonline.com/warhammer_40k_codex_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/ficjdbH/22417702066.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/1bc81a5d-1731-422a-a1bc-a5ec34ca3ea0/nofalelobizokarefojidexiw.pdfIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/suzatasufegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da5e0e7-f4c0-4651-83b2-9738eaaa5d60/jojigedorid.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/gasiwosobowaremeboto.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/gobov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d6989c-436d-4f3f-aba0-4ca5f5ff7bcf/41592413398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432059c5-ebce-4ca6-9a1f-d0467f5a08fb/sofiwifaserewexevoma.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/commonwealth_of_virginia_state_corporation_commission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/xupali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e5878a-4c19-42bf-a60c-7cc55e68d474/62108679649.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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5660 bytes
SHA-256: 1ef8bffb016ecb045b95692a2352755dd6a41ec5e4a2653bc24368084b2a4030
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10864 bytes
SHA-256: 26912fbb9486ac66bc00f228dcaccffdf528ea4eaa04c4a1ea300c438fcb394b

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