Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fe16a99159e9fb…

MALICIOUS

PDF

80.1 KB Created: 2021-03-24 17:26:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8bb0508dfbf033eaf72a302dc8f67db3 SHA-1: 93f2fbfa71badd6420245c3a566b11e1de480a3e SHA-256: 29fe16a99159e9fbd323390d5535b666de50faa100d6aa388493fbe072333a32
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 0.9954

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://leonvi.ru/strik?utm_term=literature+and+the+writing+process+11th+edition+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486200/normal_602de603a56ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_6037f395459b9.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/canon_ip7200_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5ff691008e636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_604068f2833af.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/24557692509.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/tuvanav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408478/normal_5feed1ff5cd16.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/job_interview_preparation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451025/normal_603d2f10c5c5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474988/normal_6053797dc640b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_6028834939bfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_6031357717336.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/effective_modern_c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/drug_and_alcohol_policy_template_qld.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/android_studio_debug._keystore._lock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a90103-c8d4-4487-9a19-e8d499090a54/tukuwogoma.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/how_many_miles_does_a_honda_rebel_250_last.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_aab69bf6e23340d78cfebd8669ebfbe7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83d5c14-2494-4a9b-8e06-948774d88e2d/how_to_get_a_vet_assistant_job_with_no_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af358e3b-ccac-4559-b80f-5e34c68445d4/end_of_the_world_as_we_know_it_ukulele_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed8d63c5-d50e-449e-99b5-583f9d373f45/sword_art_online_season_3_wikia.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/love_story_song_1970_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cec7bcb-1e0d-4480-9b8e-8e27db1350cd/americas_history_henretta_8th_edition_chapter_outlines.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/fairies_printable_coloring_sheets.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_70a588f136594974873e05dc29bf742b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 3368 bytes
SHA-256: ac2b493eefdf779c8a4fa10c6196ebc7bb4d9cbea0da8d22363f12a9d3eb8774
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 5468 bytes
SHA-256: 58d39af525cef66a63e4f4086c5c8b20229399dc7d24b9d616cb8988921cfecc
font_02_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 11684 bytes
SHA-256: 9d81d569bde59a1b35d5cb69dbfa349ce087bd68546d9e9ff28178485a005a0a