Malicious PDF — malware analysis report

Static analysis result for SHA-256 5159ec319aab7afc…

MALICIOUS

PDF

74.9 KB Created: 2021-03-11 18:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 782d1cec1b174a16adb799b555fc52f2 SHA-1: 5049f8183593422710d8dca95b22d72cc282349e SHA-256: 5159ec319aab7afc6440f629f1f10d8c8e26e3cfe7aee30784d933e4200d9f74
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an external URI and an image lure that redirects to the URL https://baarspo.ru/award?keyword=separador+de+documentos+pdf+online, which is likely a phishing page. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'separador de documentos pdf online', suggesting a lure for a document processing tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://baarspo.ru/award?keyword=separador+de+documentos+pdf+online PDF link annotation
    • http://azakalaza5.xyz/singer_confidence_quilter_threading_bobbinmtaa6.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/call_of_cthulhu_basic_spells.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/maya_angelou_poems_woman_work.pdfIn PDF document text
    • http://effektzhizni.ru/57509054578v7e7c.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/jspdf_autotable_header_height.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/18635998358.pdfIn PDF document text
    • http://dihtyar.online/tcp_ip_protocol_driver_service_missingubx06.pdfIn PDF document text
    • http://help-business-media.com/superdry_womens_hoodie_size_guideceavz.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/sunda_wiwitan.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/how_much_does_it_cost_to_replace_a_rooftop_air_conditioner.pdfIn PDF document text
    • http://skidki-day.shop/96066200887tdrk0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavuvije.epizy.com/what_are_the_problems_facing_hotel.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/32709602494.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/mandatory_reporting_form_california.pdfIn PDF document text
    • http://miborebosat.rf.gd/tuvirok.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/lomeniteluzo.pdfIn PDF document text
    • http://tuzajobiwazotuf.epizy.com/84655337918.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/22787890883.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/kuvevake.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/sijawegozutekufovafidi.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/bebuzobafozipopurag.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/pumukupivunakixapiwujidi.pdfIn PDF document text
    • http://takefaluzimun.rf.gd/79027890153.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 5404 bytes
SHA-256: 8cacc4e6696c8e9488256c7cced8a76127c8b58ce6825d2adcd71d48ad71e04f
font_02_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 11428 bytes
SHA-256: 6987c6af4bbc7e0329b8b428c821f148e1e7d772b4b7106b89bf61969b8706ff