Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d68001728ca276…

MALICIOUS

PDF

74.2 KB Created: 2021-05-30 18:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3c11d34ef46349acb38d051ba7f536fd SHA-1: 86c00b2046f87df609b893815ac019c3464750d1 SHA-256: 27d68001728ca2762fde50b7bd04e413860e0e1c0a0e93f88c2167688d05c65e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/strik?utm_term=how+do+you+write+a+simple+research+proposal PDF link annotation
    • https://vamububok.weebly.com/uploads/1/3/5/3/135317225/6bfee3c979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_602baa2ea000e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388048/normal_5fec8f52c5191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_605c73faf313b.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/poxidipepavisotamefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_5fdc89544d140.pdfIn PDF document text
    • https://vusowixaxepuw.weebly.com/uploads/1/3/1/3/131381533/tugizobonal-fobewube.pdfIn PDF document text
    • https://rebigakudaj.weebly.com/uploads/1/3/1/3/131383708/nutizawal_viveluvizemusa_bilezoxanuxa_zojepuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383929/normal_5ff522fb696c7.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/0d750ef80e9f84.pdfIn PDF document text
    • https://nedetufajazigaf.weebly.com/uploads/1/3/1/6/131606803/5128939.pdfIn PDF document text
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/cddaa1206cb4d9d.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/48ab93fe-ce3b-483b-b07b-31ad0aca5f90/36837792766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16dda4c-4c13-457b-bd9e-e00ccc2ab1fd/how_do_i_know_if_my_rv_inverter_is_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74cfcbbe-47fb-4300-a301-c5a7b148a976/71005540373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413504e0-5770-4ad9-a763-e37ea12d4b94/is_samsung_uhd_7_series_a_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e84fef1-12d9-4a2f-8f29-e67b56ad28de/46283373163.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 5468 bytes
SHA-256: 98a35b1cb39f9a9375735aeb61b9b17ace1e7286259ba976ea0090e0b65c05ee
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10752 bytes
SHA-256: e820c6914462c066a6c983ab36f83202af5730048b9675872fa13483e34475bc

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