Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70b022db4ad9142…

MALICIOUS

PDF

76.2 KB Created: 2021-05-28 21:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ad4dd5480c7a59ab8331192de6c4c23d SHA-1: 91cc0b7b5866d510108d536133e48502ecad8980 SHA-256: e70b022db4ad91424b50ff3ca52f92777dd2d8c2f5a9d3d99438aa43f9756e0d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The primary malicious activity observed is the hosting of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=vaillant+ecotec+plus+637+flue+manual PDF link annotation
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/vidakidajesolatok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_6051f7414a531.pdfIn PDF document text
    • https://pijutizomi.weebly.com/uploads/1/3/4/6/134686964/gezimorivojul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_6044f70a2d792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_6009cd1c1c79f.pdfIn PDF document text
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/617439.pdfIn PDF document text
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/popufo.pdfIn PDF document text
    • https://pomaripo.weebly.com/uploads/1/3/0/9/130969966/8923697.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/befeduzemik.pdfIn PDF document text
    • https://wokewimafagi.weebly.com/uploads/1/3/4/5/134598023/7972537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_605715a4a1789.pdfIn PDF document text
    • https://moxujudafetofa.weebly.com/uploads/1/3/2/7/132712376/7521046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5fc5e747bc9c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/657ab2f5-09a1-445e-8068-3afc634fb919/34736933390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd57793e-24a5-4604-89bc-11e9fc8d16d7/oil_gas_mixture_mercury_2_stroke_outboard_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf74dd1-33e6-4bb0-8010-29bc7b10ae36/59567771674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f62ab4b-9a84-46fe-8e2b-1dd73f164bc8/walmart_black_friday_sale_november_4_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0563996-30a5-406f-969c-216e20a7bd6f/xurilolopasogegajudotifeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcb8cd2-35f2-43b5-a17c-f8bf8217d65e/the_checklist_manifesto_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816b0c8f-5e9f-4c18-b561-ed3b3c447b8d/zowun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3628d9ed-7caf-4591-9256-0a15456303ba/letazavigisulavozasalunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a72afc-5869-4363-9b57-1eb06ae10b34/33838419508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0213d8-8cd6-4b26-abdc-57a3e654e455/63074157117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc78ddf-dc56-4a9f-b116-616bc413b662/what_size_battery_for_miller_bobcat_250.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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 5428 bytes
SHA-256: e5d0a038ef3984885ef757062422926143808d4ae2aa1c1a5b3a10c9f588520b
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 11700 bytes
SHA-256: 7ba8a7b40407fec5c9f43253fe18e9af4567a521e88594d614a2e825b65d3947

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