Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a147efd81e443c7…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 16:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 85e3fc060b9713e96bf8b8561869ec6e SHA-1: 2e097efd3a3c2f7879fbbc91981531547aacc2c9 SHA-256: 1a147efd81e443c7b0c4e5d8e91d75461007eef301fcbe88c059fb33f996ad85
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://dugedepap.ru/wix?keyword=gamma+upsilon+kappa+alpha+psi', suggests a potential SEO manipulation or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/wix?keyword=gamma+upsilon+kappa+alpha+psi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419650/normal_603f5a8f4bef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_601d2f98249cc.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/6jghj2F/22270078760.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jit4Tjf/amazon_alexa_echo_show_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_6003cdd6aa4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fe6492f3c2bb.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/jigfDb4/simesarusemanomif.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/hjNgeih/92537534913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fd6aa272c963.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_779d36a5bee24a60bb26df808e7d7409.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_6359e6c8fd8c487194d456a8872abe92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/670602b9-035b-4e5f-8d5f-dbaf3b0b34dd/rifirojutamekajakilonepi.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_58670e35a3af4002a8f0c2c1dee2ad7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fab84b4-b573-4e92-b7bf-bf23317a6728/how_can_i_improve_in_my_english_speaking.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_c24d29fabd5a447284b14cb9ebaaa6fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95fe3ca-0bf9-42b0-97c9-5a13f297fd23/why_did_my_deep_fryer_stopped_working.pdfIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_403576319db44f5593bb0995051be6cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99b341e-de89-4839-ac40-60009a5ca1d9/cul_es_el_proceso_de_una_investigacin_cuantitativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c81b2a7-2c68-43c9-b828-1ea8217a87de/can_you_start_a_paragraph_with_a_quote_in_apa_format.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_1c20a5d77e084b8fae0cb4d3c8afe4ba.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_b57272d4891f4c879f474e43509087a0.pdf?index=trueIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_07caec3b8c6148768b9103431e91c437.pdf?index=trueIn 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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 5056 bytes
SHA-256: 776b1ae1b942261d81d877fca64a0488210b648422d89f70decc549ab0a18ff8
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 11920 bytes
SHA-256: 7998f0bfcae5646ec40f9bf7c9b7621dddd70a312d1f9e1e486ca618c42e1459

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