Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd3f47aa614b0b2…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 22:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7a64385d9735c45222ec653e2b482aec SHA-1: d66c509d2cb51787458c37e35a141c1973d4875d SHA-256: 7dd3f47aa614b0b20087e696831328f177fb340f0b5ef46daafca4ea01c25353
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF documents, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or distributing further malware. The primary attack pattern involves directing users to external resources, potentially for SEO manipulation or to host malicious payloads.

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://botokaw.ru/strik?utm_term=how+to+structure+a+song+lyrically PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5fcb2e9d850db.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/id2ghhj/hexion_uk_locations.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/divopasub.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/6ifbpie/97932123099.pdfIn PDF document text
    • http://jisuvakuwiraza.medianewsonline.com/39569113279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_604f9bf777e8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_def2ecf0e7804d0d88d4a097ee8cc8e5.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_5c3e643e3a774a0081bbae1a1541bed6.pdf?index=trueIn PDF document text
    • http://mojenuj.atwebpages.com/xefasoxakugu.pdfIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_c22c55772a3c4aaf8a3946b558e753e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurafoga/42269506818.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_ffb2e16dc9cf400384933039f53e842a.pdf?index=trueIn PDF document text
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_67956ae2b37d4fbf821bf19d8a5bff5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bond_energy_chem_worksheet_16-_2_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/waze_android_auto_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/porsche_911_performance_engines.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_8ea5166ba22b4403aa51106e15c9579a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/servlet_interview_questions_and_answers_javatpoint.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_6ee288c4f067414992100a4569832346.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_0c424a37fe8a43fcb09094df1273f650.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_0b913ca9f6f84e72bf8a37ba66193e68.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_13e99e4e64274b5b8cc5d70a3458cf57.pdf?index=trueIn PDF document text
    • http://pawuzax.onlinewebshop.net/naloboxelutawomal.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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 5124 bytes
SHA-256: d9da8a18ae1488fc1fa3f79d0578c27fd839b4f44225a3123acc9b441d2b1255
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 10964 bytes
SHA-256: ad402d1f9df7cd78614648b94ddc8f06936804aa1d012e050335502ad63505a5

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