Malicious PDF — malware analysis report

Static analysis result for SHA-256 535ba8301daf2e73…

MALICIOUS

PDF

67.0 KB Created: 2021-03-20 19:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0e29aeff155fb602cabd464db95dc273 SHA-1: 784db24b5ecc8a45564b724af8fd19533f23c6e3 SHA-256: 535ba8301daf2e73e9897bbfc9f5974e3581b79094db36a668b1fdbaecd797dd
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high concentration on disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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
  • 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.
  • 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://maypoin.ru/award?keyword=narrative+analysis+riessman+1993+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369306/normal_60027e9e6021a.pdfIn PDF document text
    • http://metryck.info/98719520776inju8.pdfIn PDF document text
    • http://biotringel.shop/839048797111tbgc.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/d3QZxZs/witcher_3_fists_of_fury_skellige_grim.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/x1i0hjg/xanumizuxezomituki.pdfIn PDF document text
    • http://kukushka.space/tutu_app_not_workingnj33z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_6048aa135d801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fcba554990ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5ffe0bb90658d.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/d7hifhb/pinkfong_abc_phonics_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_6040e36a77c65.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/ejjLjaO/amazed_by_you_movie.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/wezukep/girenifon.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_a51f62b6c379475082980d74ec0ba9b0.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_d847d17f00f94e6f885112d9581a038a.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_04acf15bbd644a0a9dca44f0852ab387.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_ce5b2ddef0cd47298581c1ff0c57951d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c37d589-b18c-4bbc-877d-f5ea1f722c90/how_to_test_craftsman_19.2_volt_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf1c269-6ebf-49fd-aa5c-76599f2ad32d/why_do_i_feel_so_hurt.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/thomas_kuhn_the_copernican_revolution.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_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 5688 bytes
SHA-256: 76f7db87666f3b1586ff7eb47d9d25b1ad61cb09d0a9211b8cc88277a98ea265
font_01_sfnt_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 10284 bytes
SHA-256: 0a4fd7c306a9d2b2a8a6969f0fbeb7f9ef049a2dbc2358cbefddbfee2ff7b52d

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