Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f3e4799dfc90cc…

MALICIOUS

PDF

85.3 KB Created: 2021-03-19 14:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d65ebfca8d856a2e9d5ef450246717f2 SHA-1: 5a6ae143a728928c91852e29893b26b48cbfd03b SHA-256: b2f3e4799dfc90cc6b5581b589f5c6cba72d3d2cfde57740192785f229f57cef
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 0.9992

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://kuzutuzo.ru/strik?utm_term=how+to+replace+toner+in+brother+hl-l2320d PDF link annotation
    • http://lisolu.org/43381551403thkoy.pdfIn PDF document text
    • http://gtmedis.com/794892586410u668.pdfIn PDF document text
    • http://wimudevereru.sportsontheweb.net/calorific_value_of_food.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/livros_espiritas_iniciantes.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/lunitezigagejadu.pdfIn PDF document text
    • https://mugilofovoki.weebly.com/uploads/1/3/4/6/134616553/tokobazebofobata.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/fidedixisis.pdfIn PDF document text
    • http://uorott.com/xisapurabigesixxsa7y.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/gevodonimodibix-kikafor-javidol-xixiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ba3a8b-7516-419d-94d8-01ed93dd6e68/viwutab.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/how_to_share_someone_elses_instagram_photo_on_facebook.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_808e72bdbfa74df7bd7b47ce7100f513.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/binder_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/rowafikamopajokiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a7948e-6fd4-47c5-888a-adf7396cffe7/omron_blood_pressure_monitor_model_hem-711dlx.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_ae62eb2ef81846e894306c967de5eeca.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_aae8696af0974324832060ed64b2b49a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/418a338b-18c4-4731-9e49-bb2dd7ba709c/6049461238.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/49910032617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657bf8d7-207c-4804-a70c-2b7d0391df47/55488039692.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_c7f99d84f2c445958113c6210ad39dee.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_9abfa36fdbfe4333a2cbe6bf034da527.pdf?index=trueIn PDF document text
    • http://valupakukav.myartsonline.com/1056303180.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 5644 bytes
SHA-256: dcd6adb3209f5cb4cdb96ee7e4ab91e2b28c867fe5dd2f76594abf1c8cdf15c5
font_01_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 11112 bytes
SHA-256: ea63e71732d6e2144fb3c4d4c906a5e8bc05b80535871aae34ad80788dec9e82
font_02_sfnt_off00013035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13035 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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