Malicious PDF — malware analysis report

Static analysis result for SHA-256 d215b3e086de465b…

MALICIOUS

PDF

78.7 KB Created: 2021-02-14 07:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 70839b6c3d6092bc5c61341b4b1a35d4 SHA-1: 25bb64befa552f3fc76b84690917636ac046f045 SHA-256: d215b3e086de465b16bcfba0fc98d2b0390bf1b34c941691d965fd36ab919385
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains a high density of embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm or SEO spamming operation. One critical heuristic flags a link to known malicious redirector infrastructure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=kosher+dairy+restaurants+manhattan In PDF document text
    • http://peludofnor.fun/kakibelkfg2.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/igf4he7/puropuxikosix.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/xixutexotanufam.pdfIn PDF document text
    • http://lnstagramsecurity.net/angular_5_ebook_free6gsay.pdfIn PDF document text
    • http://giftcard-sale.store/bodyguard_movie_ringtones_freeeiouc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388060/normal_6004400204c47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5fd04479425f8.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/eifBgen/tovati.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/fr8mBoG/fidiset.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5ff4f89ec4b27.pdfIn PDF document text
    • https://kibepujuvug.weebly.com/uploads/1/3/4/6/134644113/4948896c67.pdfIn PDF document text
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/217576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5ff3829251d8c.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/zakunafu/av_malformation_radiopaedia.pdfIn PDF document text
    • http://zitikezig.rf.gd/carrier_inverter_aircon_window_type_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/48557911989.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/kosogowereliki.pdfIn PDF document text
    • http://jopimuriwunewok.epizy.com/japidurokoxokovanurav.pdfIn PDF document text
    • http://lizusesujujes.rf.gd/in_on_under_next_to_between_worksheet.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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 5104 bytes
SHA-256: ce931e618e6317bbc9f07fdcf2322348303f5e19e92467b6131558158dc727bf
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 13576 bytes
SHA-256: fbfe07237db315ac2fd55d643699103f221ca9c651a00ed96993ebdc1cc93327

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