Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bdb409f5b219cd…

MALICIOUS

PDF

75.4 KB Created: 2021-05-01 17:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cb32782ca0113d96d1d17030f03f9b4c SHA-1: 5afc1d95048d3647d20f31bc7bd89c1f63ab2a02 SHA-256: 19bdb409f5b219cdb241b43632a34270f712ca364b8be4fabda5253908614cbd
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-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+add+symbols+to+pdf PDF link annotation
    • http://xukigebek.iblogger.org/fufisumuxapuzadivupakap.pdfIn PDF document text
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/fonarevojowewod-joripi-xabulapamijolan-sesixu.pdfIn PDF document text
    • http://levelupguild.com/topunagiji60q00.pdfIn PDF document text
    • https://fevowavekotaxuw.weebly.com/uploads/1/3/4/6/134635114/sazenazogi.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/salesforce_apex_interview_questions_answers.pdfIn PDF document text
    • http://clientesdkb.com/vopigitebiwiih7zg.pdfIn PDF document text
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/gupisurodarej.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/the_antinomian_controversy.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/how_to_be_a_music_lawyer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_6a9164ecad0d4bf6a7c8915a8f65304f.pdf?index=trueIn PDF document text
    • http://zevideto.rf.gd/kitchenaid_model_ksm90.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_20b41db9fc34496083221cb66698a860.pdf?index=trueIn PDF document text
    • http://felawikemuda.epizy.com/haloperidol_mechanism_of_action.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_eee1332c911b4da2bdd1f060c2dd3d2d.pdf?index=trueIn PDF document text
    • http://dunuruzofugavix.rf.gd/gastric_cancer_2020.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_ba4c9f295a7f4e2589a578a34bcffc4a.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_0e2fb4295f8840a9b4e942e4edb330f2.pdf?index=trueIn PDF document text
    • https://0b196949-32cf-4fe5-af71-696dce18df0b.filesusr.com/ugd/69695d_e93589f159454564bac170847f4ce426.pdf?index=trueIn PDF document text
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_d1b8209555b148e19df61d80a296bd90.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_f896f8ed064a48d1b570e5098227aca8.pdf?index=trueIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_dfdb70dc12cd469da491bcb7aad0863c.pdf?index=trueIn PDF document text
    • http://sabukizazuse.epizy.com/buyee_media_player_manual.pdfIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_2fdc71f742de444aa4c5b45a38702f03.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5388 bytes
SHA-256: 2b07ab5b88fdc783f30bffeb1e0e7da30f3799c49c2a1fd5c9749df96872c410
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 11028 bytes
SHA-256: 55e3800817c28675e87a9fd18e2acbffb545b5bff1eb94918dcb17dee03e5df9