Malicious PDF — malware analysis report

Static analysis result for SHA-256 49133e89db5345b0…

MALICIOUS

PDF

71.6 KB Created: 2021-04-05 11:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ca50cf1682fefcd61feb2cb28dca1d42 SHA-1: 02cf6743e40bedd80d0a6ff10820f6bddb51c046 SHA-256: 49133e89db5345b05ea649607f40ac51c6e650f70d846396d71fb4c26a7e0f27
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The embedded URL `https://pelibifir.ru/123?utm_term=baker%2527+s+secret+air+insulated+cookie+sheet` is identified as a redirector for a free-download phishing scheme. ClamAV also detected this file as `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0`, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=baker%2527+s+secret+air+insulated+cookie+sheet PDF link annotation
    • https://vuteduwezo.weebly.com/uploads/1/3/4/3/134336695/7695101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5fda9448c8514.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuzunon/jghaHv6/picot_sal_de_uvas_para_que_sirve.pdfIn PDF document text
    • https://dimavuvinidet.weebly.com/uploads/1/3/1/3/131397938/9270397.pdfIn PDF document text
    • http://pimolala.22web.org/58953353476.pdfIn PDF document text
    • https://raxuzorufureraw.weebly.com/uploads/1/3/0/7/130775378/betozaxiviguraxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_601363be8b3df.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/5782b5cc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc64ca0b63ea.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/jgRO6hd/fojonunatanuvol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gedapewubu.epizy.com/national_geographic_magazine_december_2020.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/pippi_langstrumpf_astrid_lindgren.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/guidepost_post_office_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/89637008567.pdfIn PDF document text
    • http://tigefaxoweta.rf.gd/stream_overlay_template_no_text.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/ritokebalixutini.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/zavazipopiniz.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/siwiga.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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 5172 bytes
SHA-256: 4d79674961459846d0472925fbef0c17467e3993c339fe1dddcb97ba225741ab
font_01_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 11248 bytes
SHA-256: 53e6210bb2e62cf4f557d12ea08ecd3616e9b38d28c7dc1393f4432956dce257