Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d931ce6acf4441…

MALICIOUS

PDF

75.8 KB Created: 2021-06-10 08:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 26771c6393e64df775ffd39da0061ebf SHA-1: a977181d5b4d4d662724ab47426d4347e108af7b SHA-256: 03d931ce6acf4441e269f0efb2deb9ffaae74d3c098c9948563f5414df3df10a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm and a critical ClamAV detection for a phishing trojan. The document contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

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://nomylo.ru/pbw?utm_term=animal+physiology+and+biochemistry+book+pdf PDF link annotation
    • https://rufibomorogad.weebly.com/uploads/1/3/4/5/134505720/922075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_604cc3603d154.pdfIn PDF document text
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/6580250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_60bbf00010bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_606c9dd79decc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_604a3c8fc1403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_6062abf2e25ac.pdfIn PDF document text
    • https://fevokokedu.weebly.com/uploads/1/3/4/5/134500062/7281027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_603fd9ae1f095.pdfIn PDF document text
    • https://jasidixivogejo.weebly.com/uploads/1/3/4/7/134749747/ab80db04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_600f60118bbea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406228/normal_5fc7589385b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_6051c50170716.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/sowuvapuzel-kobekisi-daniwug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/33bfafce-3278-4209-8c01-e41c8c9e656d/why_is_my_turtle_beach_headset_not_working_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2277684-09fe-4fab-b456-aba00b188921/chevrolet_malibu_2010_transmission_fluid_type.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 5652 bytes
SHA-256: ab8161b3535908fd0aef25fea8e60bb1570d9f5da2fd19a876dbeeedfcc55a61
font_01_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 10292 bytes
SHA-256: ecd3c04be4401831244323aae3a99b471264fa234c1a9951d2d49e562b528992
font_02_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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