Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e5740f461dddb8…

MALICIOUS

PDF

61.4 KB Created: 2021-02-20 15:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b9166e74565e517a3df7fce37f03431c SHA-1: ea86d61277a6d2d6d020abe973a76ec1cf5e7b8a SHA-256: 28e5740f461dddb8a8011d9a256ab254dc595e489fb2665ffb326d445b659555
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bologen.ru/wix?keyword=city+of+houston+design+manual+2020 PDF link annotation
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/waxoratoku-nejuninonimuwik-fulimerubasozej.pdfIn PDF document text
    • http://nipikul.22web.org/sanejefeviwekilodurumu.pdfIn PDF document text
    • https://munojafejim.weebly.com/uploads/1/3/0/8/130874523/xolun_xekumowi_xupufo_lamamizafe.pdfIn PDF document text
    • https://vupixesit.weebly.com/uploads/1/3/2/7/132740805/2255098.pdfIn PDF document text
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/f5429110cf9.pdfIn PDF document text
    • https://verikadofaja.weebly.com/uploads/1/3/2/3/132303102/849e22ab591a9.pdfIn PDF document text
    • https://rinavupitaf.weebly.com/uploads/1/3/1/1/131164375/nebexudojozu_jusajomok_fiwaj_nojonoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/2hihdhh/blocky_bfb_asset.pdfIn PDF document text
    • https://vasirorikipik.weebly.com/uploads/1/3/0/7/130776585/35526d122.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/6Dnjaia/costco_sales_booklet_february_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/cellsalive_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/rutovelabowiliwemoruv.pdfIn PDF document text
    • http://keputeka.epizy.com/bulbul_kannada_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/zukujegudibimuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/apache_web_server_tutorial_point.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_off0000b641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB641 5508 bytes
SHA-256: 7ba2f721e53a67fc01fd8191a3f821b44a26d94c2475b9d9b656c49bca6d25d9
font_01_sfnt_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 9356 bytes
SHA-256: 79ec246417e56f05df977a70590819cb6c6e93a89e40db480f5a7f1a81aae900

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