Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca25b8bf3ce2564c…

MALICIOUS

PDF

111.9 KB Created: 2021-03-18 18:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: faf9ce4c66aabc4ff4baa59661d59b9f SHA-1: 59f4f466ce80fa4a30a3d89a3b82e7843e4cbdfe SHA-256: ca25b8bf3ce2564cbadeec51bd57d94336494b3ca568884ce2e9f7e44ce95422
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to host numerous PDFs on disposable domains, with the primary URL being https://nipisod.ru/award. This indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=antiparasitarios+humanos+pdf PDF link annotation
    • http://zoosalon.org/exercises_during_pregnancy_to_prevent_diastasis_rectiu5fwt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5fe268d8de5e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_603d4cd414782.pdfIn PDF document text
    • http://foyou.store/how_to_pass_mcsa_server_2016cd7tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcf461782155.pdfIn PDF document text
    • http://esclick.pro/best_launcher_for_fire_tv_stick3kmxx.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/72063695587.pdfIn PDF document text
    • http://psyhologrzn.ru/8535629921762q0d.pdfIn PDF document text
    • http://free-at.pro/liwonajebapozabodmk13c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_6013df908fda4.pdfIn PDF document text
    • http://tur8osale.site/wedding_salon_game_free_download_full_version7p0qz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470552/normal_5fdd3f87f2395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_604bab6c36cb3.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/40251655024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_604aa905a8642.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/7a9baa48-df3a-4024-91be-0cf7058c3122/81094660116.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/sowesafezusul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16802175-6360-4e8f-be44-d8aae9e029f1/74250885085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90596d8-7c3c-42ac-b358-5d8b81ef790b/universal_laser_systems_vls3.60_manual.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/los_de_abajo_mariano_azuela.pdfIn PDF document text
    • http://gitodake.myartsonline.com/application_of_biosensors_in_food_industry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a283ee-2f14-4a02-89c7-6fafca5d3bcd/what_lures_to_use_for_mackerel.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_off000175bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BF 5240 bytes
SHA-256: ab3194d2db294e2f5ef8895c02ae5a35a38d61c8c44ec7c610ca87b5d026d3bb
font_01_sfnt_off00018765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18765 12732 bytes
SHA-256: e9379d89965575cbc0533e10f51b0bc853311b4ee393ff35d866cb3777f2ec4d

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