Malicious PDF — malware analysis report

Static analysis result for SHA-256 945b2d710f0cfddc…

MALICIOUS

PDF

87.7 KB Created: 2021-04-04 10:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa1750b14ff1314db30675c5bbb47180 SHA-1: 183391ff64c5add15cdb17512f2f8ce981593564 SHA-256: 945b2d710f0cfddcee1ee318f09e8067a2119097f8ab3822c84248760efa462d
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 0.9998

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://fokemale.ru/strik?utm_term=how+to+start+learning+.net+core PDF link annotation
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/4397464.pdfIn PDF document text
    • https://zazafiwizodizi.weebly.com/uploads/1/3/4/0/134041258/7381035.pdfIn PDF document text
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/6421143.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/gupudanis_tomaxoru_zuzutakowas_sanuxejudiduwe.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/4088255.pdfIn PDF document text
    • https://bevalapiwilidi.weebly.com/uploads/1/3/4/5/134587476/gulitotut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_6024ae54a15d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_60192d1f95f70.pdfIn PDF document text
    • http://max-lifting.store/70165489219hf7wz.pdfIn PDF document text
    • https://rafitiwaxaxeb.weebly.com/uploads/1/3/4/9/134903343/nakoba.pdfIn PDF document text
    • http://soldonlakewood.com/favibezaxikevdz5z6.pdfIn PDF document text
    • https://bakurisevujukuj.weebly.com/uploads/1/3/4/3/134368754/govazelewoxamejul.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/9640076.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/cf0b43.pdfIn PDF document text
    • https://vesovagesigopek.weebly.com/uploads/1/3/4/6/134614223/zafadasozejafo.pdfIn PDF document text
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/9091657.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/9eb7abb7-29b8-4dbb-a5d9-60bf2fb7adcf/dragon_age_origins_rogue_stats_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102f68c0-6f77-4da2-ab64-1d912ac68d4f/brother_hl-l2305_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e0cfd5-b1a6-415e-b52e-078dab53accf/nasimonowiwakinemedig.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_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 5052 bytes
SHA-256: c9843f2308daa215d7b90f2cb202bdcc751752c5548d4ecfb4e27a0cb77ee04b
font_01_sfnt_off0001299c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 11768 bytes
SHA-256: f918276c6251c5128c33e86e0993df72fc59fa356f3a548ed2874b1681154b8d

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