Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93c1397a19dc450…

MALICIOUS

PDF

85.0 KB Created: 2021-02-12 08:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e01abd422bcd6ced7f7bf5264d2d63da SHA-1: 7f2790a271cc6e3bc04916c6346137265cae05a9 SHA-256: c93c1397a19dc450034f25fb55ec208ec8d34205daf3891a92e1352dbfb07d3f
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous external links, with a primary redirector URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics indicates a tactic to generate traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=apush+period+8+test PDF link annotation
    • https://vuzizakepavojen.weebly.com/uploads/1/3/1/4/131484090/3555291.pdfIn PDF document text
    • https://nafizanoride.weebly.com/uploads/1/3/4/5/134596231/19cb474cfd585.pdfIn PDF document text
    • https://fiwibafufo.weebly.com/uploads/1/3/0/7/130774969/f6a8668be9d8.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/funupopafegokopesodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417040/normal_5fe435303bb5d.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/kekakap.pdfIn PDF document text
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/2450456.pdfIn PDF document text
    • https://betepojikimiji.weebly.com/uploads/1/3/0/8/130874485/7694315.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/foratunet.pdfIn PDF document text
    • https://gujuxufun.weebly.com/uploads/1/3/5/3/135398829/waponojo-judopegatokiris.pdfIn PDF document text
    • https://ponirusorigimo.weebly.com/uploads/1/3/0/7/130738629/6934558.pdfIn PDF document text
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/vibebe-japarugateboru-ritofalezama-goxiwivuw.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/kunozunu.pdfIn PDF document text
    • https://wezalowesugalu.weebly.com/uploads/1/3/2/8/132815960/2013d267.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/rubidokezive/kit_barcelona_2020_dls_19.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/character_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/bahubali_telugu_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/batman_beyond_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/siber.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 4988 bytes
SHA-256: 18d033eb0b37bdf7ce02e2cb8b57429590be22a30bfb5d4545c7e43dc8a56730
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 2476 bytes
SHA-256: e4d640677a49cb47209282a42d247dcaadc86b62eaf007a8ff1539815102b758
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 10720 bytes
SHA-256: 10c4d66732f06b08d1e3ef692ed77afc072fcc184b08f9c8f3ecf1f6b62365c5
font_03_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 16288 bytes
SHA-256: 221ee9624d47ec5586ce356b80a5502d1f943aa1c0692a70955fb26bc04b4050