Malicious PDF — malware analysis report

Static analysis result for SHA-256 134cf57333065365…

MALICIOUS

PDF

71.1 KB Created: 2021-02-19 14:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: e92808d433fc1d01586b4a30679a76cd SHA-1: 20acdea257ef8a716785054e8f9562708d056f1b SHA-256: 134cf5733306536578cd13e8a63ceffd7b3743e728136cfacb1ad3df4f1accf0
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=isotopes+worksheet+key PDF link annotation
    • http://megarafulosibef.22web.org/sodulixipotigixe.pdfIn PDF document text
    • https://pezomivagijo.weebly.com/uploads/1/3/5/3/135392772/remoju-tovazab-jiburu.pdfIn PDF document text
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/luzanikoviv.pdfIn PDF document text
    • http://wuzubofetaxoger.iblogger.org/compose_and_decompose_numbers_11-_19_worksheets.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/fa16c.pdfIn PDF document text
    • http://wugafis.66ghz.com/58220184866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wutogugej/babizijowuwinovikezuf.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/dmv_permit_practice_test_answers.pdfIn PDF document text
    • http://bozudob.epizy.com/48831084420.pdfIn PDF document text
    • http://lunodemexixape.epizy.com/pivafirukesenazes.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/timefuxovimu.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/jacques_attali_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/87936996695.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 4492 bytes
SHA-256: f22151fdea4c73f5e97dc2a10c2264619edb91f25ad02e3e4ef34ab520fcd04e
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 9980 bytes
SHA-256: a36da3e025c62c504e52cce4e4a1ff506a413b15b4a8eb52fc458a680bc1df43
font_02_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34