Malicious PDF — malware analysis report

Static analysis result for SHA-256 a015250ae5ac456b…

MALICIOUS

PDF

71.4 KB Created: 2021-03-22 12:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 09e488cd25f3375faac3cfb32c66d291 SHA-1: 70a19637c35b5a251e90e889094bbd179ac5f716 SHA-256: a015250ae5ac456b949078cfc09924ddcf625d6b78742529784f4b448a54df9e
186 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. 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-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://xezojetit.ru/strik?utm_term=practice+ph+scale+calculations+worksheet+answers PDF link annotation
    • http://watogoda.mypressonline.com/anatomy_and_physiology_coloring_workbook_answers_chapter_14.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/metformina_efectos_secundarios.pdfIn PDF document text
    • http://logoped-samara.ru/las_uvas_de_la_ira_peliculamnbbx.pdfIn PDF document text
    • http://autocredit.moscow/fe_exam_prep_book_amazondc86d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_50f3dac5d64341b1a35d7b205fc9dd4a.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_736a9f2de8f846d19f5f9a496e954718.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_12e3d121427b4cea9db6633ecdf5334a.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_2b095dfd0ad646848bfc3c04467b9dac.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_bc68ba3b53094d9cb03caccf284a8257.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da575093-a075-4df8-9447-644f5031f3f2/twitter_sports_illustrated_swimsuit.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_c030e89f82ff402296ed16b38427a5eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/golevugadevo.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_3bd43f3a0ce445aa950efce2921a32f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geraromu/21583270478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28a066f-79a7-4a27-b30c-ec0f63783996/download_driver_hp_laserjet_3015_windows_7_64_bit.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 5176 bytes
SHA-256: ffaa1f8920ef7c100db6bd8b3e47f17b8b1d70dcb11cdefbb86c034ae00ded00
font_01_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 10484 bytes
SHA-256: b32445947d02b0f5ca68f30a38ff2dfba9139ebe6ecb3c95e0b6b941bbf46e79

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