Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20decd180b74dc9…

MALICIOUS

PDF

75.0 KB Created: 2021-04-06 08:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8d90b4c07dbccdd86f9650cb92191551 SHA-1: 0a2edba5ff80b140677e22cf167b741b3e1b43e9 SHA-256: c20decd180b74dc983aa1747967264cd9288e7bf8b4e4dd88f18689d10be055f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=biblia+reina+valera+1909+letra+grande PDF link annotation
    • http://fidekeleko.medianewsonline.com/cambridge_english_proficiency_1_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/YLiagcS/superhero_extreme_jet_ski_racing_and_water_races.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/butonuxumarasagatusag.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/dokejevukaxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/jDl4hcn/ditate.pdfIn PDF document text
    • https://cdn.sqhk.co/vatopibar/ahahfja/84663501921.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/butchart_gardens_map.pdfIn PDF document text
    • https://cdn.sqhk.co/mamuxejoxe/hgiey3C/dadomaxoz.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://b7953657-6b45-4ea9-9d9d-f701e3f26526.filesusr.com/ugd/45996c_eab86040959b4e5e957e859c2b497b91.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_6dad4f9658a34550ac92d84573b75feb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f229df-d244-4b80-95d5-052fe9857ef9/8010652451.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_926337d042774d0c820788b3768bd7e0.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_7083bde14dba4ea78bff5175a5ce08dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9f0236-c3b0-4a0f-9794-b06cbf9b332c/ganosupax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da0cbb5-f7b9-40ec-a9f4-d90f3975b432/67144214749.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_a109142c1d544a9781f31935a254834c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a72c99f-a885-4de8-b853-0c27f9774d68/lelijopuni.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_aa6d978b32de415397230d41a0676565.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dagasopones/boom_boom_dj_song.pdfIn PDF document text
    • http://suxudogakol.myartsonline.com/eccentric_reducer_pump_suction.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/kirapedemarasubifixapolo.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_848aa360c03743acbfc0deae9cd91578.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/on_eagle_s_wings_music_sheet.pdfIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_d7b0ff38698e48c09cd1a05b950207d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/formal_definition_of_abashed.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_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 5092 bytes
SHA-256: 938d32f31ab701e05b83e57e3ec6973e39bf569b338cd488bf2904fa3020a9b6
font_01_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 11476 bytes
SHA-256: 7896ea5459cb0fd8e96f73a816a6c732227968c70dfe46965819274aec4fbaf6
font_02_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3