Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2564cc303b8cf93…

MALICIOUS

PDF

75.7 KB Created: 2021-04-26 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d717b600205e464f595da9cbe1370c8 SHA-1: 19acc58497829e05b18d5b6b772d2b44255c1eed SHA-256: a2564cc303b8cf936fa35b0d7207c99a89aacf8798e42d9f276b19528f158b5c
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=what+is+a+good+household+income+in+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418199/normal_60394da026b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_601b52ef22a17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446642/normal_5ffb6014d4626.pdfIn PDF document text
    • http://vosalax.22web.org/how_do_you_clean_the_carburetor_on_a_briggs_and_stratton_550.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/psychology_case_study_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5ffc117001346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_60472575883cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5ffb2fece4565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_603e1a0d34d56.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/can_i_negotiate_car_lease_terms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxowav.epizy.com/apartheid_in_south_africa_facts.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/jokemaxupujiwisu.pdfIn PDF document text
    • http://mevukesamuzu.rf.gd/does_social_media_relieve_stress.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/dbt_skills_training_manual_used.pdfIn PDF document text
    • http://zanadogarup.rf.gd/fonutifuxujenasi.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/fundamentals_of_accounting_principles_20th_edition.pdfIn PDF document text
    • http://novoboninixeme.epizy.com/fitbit_flex_2_bands_argos.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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5364 bytes
SHA-256: 9142371f9f9fc2cb2658cb883b4777a1fc3bce984da3f309cc24a77f5a648c1e
font_01_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 11292 bytes
SHA-256: 86b1c4eb07fa3f0b349f066e8d5215821d379a0df25f877e2a18420c4fbb0727

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