Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31c3af158e18cdd…

MALICIOUS

PDF

74.6 KB Created: 2021-02-13 17:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: bbad50bd3a13a014e2928cf558befd0c SHA-1: 412261d8f63869fe208acb29ac5b14e3f56604e2 SHA-256: a31c3af158e18cdd635f9e598cd4f8ad920ea7572227a534ac4289c0d4b15335
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/wb?keyword=thank%20you%20letter%20for%20business%20opportunity%20pdf PDF link annotation
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/bosejukuda.pdfIn PDF document text
    • https://mejojesakawevud.weebly.com/uploads/1/3/1/4/131438193/tolitolijewagive.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/bgdgegj/catchmaster_288i_professional_bug_trap_and_monitor.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/voges_nezekig.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/dedosuxit.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/4547020.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/cdf0d1a534e.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwebobit/aeVjhif/wiradezovuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_5fda8a58db3dc.pdfIn PDF document text
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/nikowenaxa-mojalazulifase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fd7daec96ee0.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/somisilegex/gmat_score_report_sent_to_school.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/jojeriwenifuw.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/level_of_stress_99_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/kurukshetra_university_date_sheet_2019.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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5384 bytes
SHA-256: f43690205889a3421e151d201a18545bbdf8ed166512600bb4f3c10eb3354bc8
font_01_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 10232 bytes
SHA-256: b8603263d7b9daf5a9dc97218a80f8459acd2023b54be765925a8604244a11b1