Malicious PDF — malware analysis report

Static analysis result for SHA-256 314ca1368d6193b3…

MALICIOUS

PDF

72.5 KB Created: 2021-06-09 23:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fa0e84debee0e85b78e5322e8143d7bc SHA-1: ccf27c16773c1680caa2362c13d1e1409e26fd18 SHA-256: 314ca1368d6193b382d4f30281050828cc7eb0b755304d959a66bf4c25dd0e1a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, including one to 'coretry.ru', suggesting a link farm or phishing lure. Heuristics indicate a remote-support tool lure and ClamAV detection as 'Pdf.Phishing.Trojan'. The ML classifier output of 0.999780 strongly suggests malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://coretry.ru/pbw?utm_term=tubemate+download+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487625/normal_5fd15bb31a358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_6025375257525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470221/normal_60036617ae1fe.pdfIn PDF document text
    • https://nizikalod.weebly.com/uploads/1/3/4/6/134605229/81a2f55885a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_603e09f7717b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_6018e00237681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410016/normal_5ffa3d2f5ec1b.pdfIn PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/wuzixubuzuwetu-ganilagaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_6057ec3adae2d.pdfIn PDF document text
    • https://jiranunurojowoz.weebly.com/uploads/1/3/1/8/131860868/tibadenokezemos_kitikun.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/ef36925a-132c-4e9e-b84c-dab773a7b160/which_of_the_following_is_a_characteristic_of_transformational_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/969d4e60-8911-4c08-9fc7-817f309beb38/more_purple_more_better_reddit.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/what_does_the_death_head_moth_represent.pdfIn PDF document text
    • http://xuwedateredu.pbworks.com/f/77118217080.pdfIn PDF document text
    • http://balejuw.pbworks.com/w/file/fetch/144786222/minecraft_java_edition_free_download_for_pc_without_tlauncher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0509ea1e-562b-4fc3-a87a-ef1d262018a1/69214652928.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/w/file/fetch/144725157/dakomojanavuvasugegavap.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/how_to_fill_anganwadi_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a418f6-a132-4fb2-8918-e6a03441b323/50173915285.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_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 4880 bytes
SHA-256: c1141c18b211f5774b225688eb1905bb57d0ba01bb37c4ac1fc628707e83e76a
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 10588 bytes
SHA-256: 815433604a2702a839eeb86498f45690b68312b7495b7d2e80148a80f6d44f74