Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1a7e90739645ab…

MALICIOUS

PDF

74.8 KB Created: 2021-02-02 11:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 8d1b1c8afdd3143b9ae5e100380b662a SHA-1: 973ac969488386e7ddc8ebc7d9f1606a34c42fdc SHA-256: 4d1a7e90739645ab4e3edf885cb838b86923b6d52fe5214d5911387f3e01ec33
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wb?keyword=woodworking%20guild%20of%20america PDF link annotation
    • https://cdn.sqhk.co/xamitarerivu/jihidfJ/mad_max_fury_road_streaming_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_60142984c0d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5fe7efde70782.pdfIn PDF document text
    • http://nakozovuzu.22web.org/dutudolumuvura.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/jcZggAg/14396856992.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/gic7WqW/xuxozudaluwub.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/jghekha/cute_wallpapers_for_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/eyjfLic/monster_truck_crushing_cars_games.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/hdgcqiP/94765953201.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/88je8YU/57376489763.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/eAjjhav/susapowogukujegumivoje.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/fuposuwojowitelubu.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/FiiiggW/private_number_plates_cheap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexawisoza.epizy.com/pofujomajavi.pdfIn PDF document text
    • http://guxenubegipus.epizy.com/71972818339.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 5332 bytes
SHA-256: a55d44ee590d521a29a32640f06e9f60d36de260756070ed562d9fda204a736d
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 10640 bytes
SHA-256: a31ac813cae11c6605de2f6ca7d72bfc45f90811d41dda8c0201adea38f4db1a