Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f1b5daa8886ba8…

MALICIOUS

PDF

73.9 KB Created: 2021-01-26 12:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 912ae6aa09c7c43ebe025a387dcf4d2e SHA-1: 143759c3aa74369c2a9b5a3c8b1e04f1542c31d8 SHA-256: a5f1b5daa8886ba81e34e3cc3a565cd05b307d6decf31c2fcf4dc3cf14887b9b
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that masquerades as a search result for an Android app, likely a lure to trick users into downloading malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/aws?utm_term=english+songs+app+for+android PDF link annotation
    • http://chempion.coffee/65927574049u9z20.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/jbtOy7Y/84670117461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_5fd8d0b777823.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/zkidzJb/guzuwinuloratinow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418370/normal_5fe41546a3726.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/cNtgdij/fiat_500_lounge_interior_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/munakuvu/lhjcEjg/true_love_story_books_name.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5fd91a9cbb517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5fe8487431199.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/bipovoromoj/kinapuluzutuxotawikim.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/zitowuviduzofujujaxizedaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/bike_race_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/android_19_dokkan_ultimate_clash.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/22407338017.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_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 5260 bytes
SHA-256: e9bfd0982f4a1c6b160f06cda54ce00106ac9b5107b21bcf39bf1557e32f6ceb
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 10928 bytes
SHA-256: 81fed2876018df80d8f85a5864765e4b9b81b1a2de3515e5de4ffa71a132bccb

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