Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e5188c75cb0cdd…

MALICIOUS

PDF

90.7 KB Created: 2020-12-20 18:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e1e407ef95e8fd0babba9d63191381bd SHA-1: c33b8ea828591128cc1ea708bac1514ac178a22d SHA-256: c1e5188c75cb0cddad62b5032aaa7034d9ce22525f41dd85723fee29ef64af81
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful websites.

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.
  • 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://trafftec.ru/123?utm_term=social+justice+books+for+high+school PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ef82e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_5fa0dc0e62a78.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/a5c0ea34206.pdfIn PDF document text
    • https://fetarulezi.weebly.com/uploads/1/3/4/4/134487317/dulilaliwiruzusokapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f8fb15eac53d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fd9330e87ead.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/mirajafutori_xerasefezivuf_bawojag_sijaguki.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/nopelad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_5fd67a952351d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdc9c5f0a190b16b315bd63/t/5fdd224d07eb5f79bdbe92d6/1608327757916/wixodilab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c831b5a-23c6-452e-9e9c-a16054a24f20/zagimebazawidorubevi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6b8cf03f04e270fdfac23/t/5fcd24e12fa8bc6bcdf13774/1607279845064/walking_by_faith_not_by_sight_sermon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1adcc70-b717-4e7a-83a6-10fad01d6bc9/50_shades_freed_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/78606722572.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 5524 bytes
SHA-256: 5a5d74556824fa9c688b35178a6e9db2c022b8ae1fdddf6513e7504ab3b91348
font_01_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 11808 bytes
SHA-256: 6d02950a110ff50142b0b325e5e0304e08ca2722f36066a3946f0a07ad5848e8
font_02_sfnt_off00014858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14858 16168 bytes
SHA-256: cd3d8a04bef528154c8836079c4d42eee38dcdee0e247d542cf36c030a90abd8

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