Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e565813d8040cde…

MALICIOUS

PDF

75.2 KB Created: 2021-05-15 12:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 483a2321d91eee6ebc7afc9f8f078e54 SHA-1: 78d07acba8a4fb93d6d9e303f5e8ade121d28318 SHA-256: 4e565813d8040cde3ba44191233f2e09f957a0d59d820478c2f11040051153f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The presence of numerous external URIs, many hosted on disposable domains and configured as link farms, strongly suggests a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=lg+rebel+4g+lte+case+amazon PDF link annotation
    • http://lnstagramverifiedsbadgeform.com/fizakavazoposijav9vx1z.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/88863057076.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/kelukek.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/11364009210.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/naligibarubuvopatejilim.pdfIn PDF document text
    • https://lakowabanitewot.weebly.com/uploads/1/3/4/8/134898259/954c4cd22.pdfIn PDF document text
    • http://salonhq.xyz/zimunizokivubm5pcf.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/0f1dcf.pdfIn PDF document text
    • http://blekrossi.ru/keurig_elite_coffee_maker_iced_coffeegjzpj.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/59180929130.pdfIn PDF document text
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/nipubupadewaj.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/wowogax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gawebunopom.rf.gd/free_encyclopedia_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb79578-6c92-44fd-a407-8f1c9ee6349c/conairman_clippers_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5b2d6b-84a1-4805-9ae1-727cf453136d/86196732405.pdfIn PDF document text
    • http://wigazimo.epizy.com/pdf_to_word_online_converter_100_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e35552-5ac7-40c1-b70c-b5cb338a7251/wopejanuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d6183b-1a2c-47eb-8d2c-4727cb114f94/kijolasafona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89832bd4-3143-46f0-b95e-4c35e0f2755c/leliwijibonirebulakox.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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 5340 bytes
SHA-256: c7b71968c58b2319dd4be0ddc51157fbf9a04fbb79c7526e5d6785b973db106b
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 10512 bytes
SHA-256: ebe5c5af32b5cbea1c69a50ffaa632b71ff63385621c68cd2b75fce20c5a157e

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