Malicious PDF — malware analysis report

Static analysis result for SHA-256 29798f1daefc9b05…

MALICIOUS

PDF

88.1 KB Created: 2021-03-24 05:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4db5508836bca743e9cd46854a4a9c32 SHA-1: ef505d9f7663174562b9a13488063013f9f56049 SHA-256: 29798f1daefc9b05b87799869ff8192496c591013aab8849bef2a2c7f5185e0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9989

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=how+to+use+geometric+sequence+formula PDF link annotation
    • https://tovumanaxi.weebly.com/uploads/1/3/5/3/135392352/8e529ec1db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_60461fe75b6dc.pdfIn PDF document text
    • https://nijolonarezop.weebly.com/uploads/1/3/3/9/133999518/rokolenovupidizeri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418191/normal_60025e344f0d5.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/kevozopovetubixovonexaf.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/97149619595.pdfIn PDF document text
    • http://grafoanaliz.ru/36509925400xxj6g.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/jzef_bielawski_koran.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/469835746073y1bz.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/7045a17ddbf13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_601650b0f26db.pdfIn PDF document text
    • http://dejenojowel.iblogger.org/49999881853.pdfIn PDF document text
    • http://yogait.space/708719972011mj7.pdfIn PDF document text
    • http://miwuzobi.sportsontheweb.net/day_to_day_using_words_in_english.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/shadowrun_returns_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480182/normal_5fe56e0bc4b64.pdfIn PDF document text
    • https://subolamamojoga.weebly.com/uploads/1/3/4/7/134719430/ac182.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/66629826508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_603e24d7b84b6.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/gogoxowiniza/thyristor_c106d_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/60205186755.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/camera_logo_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/70986275370.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/dexufafofaw.pdfIn PDF document text
    • http://duvexarido.epizy.com/jijesatilakunovegezowom.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_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 5380 bytes
SHA-256: ed7c0c1bdc57cbf1805e8c513a78a74631ba4a970d0163b04c7742e79072356b
font_01_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 11868 bytes
SHA-256: c9a94d922478182b56b2e8afc0ddc381554962d6b479cba103c2a584668cb42f
font_02_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 16196 bytes
SHA-256: e51370ee3319bf7a87f361dfdc2cbb4946c0505eb3c2e16f71890129a2b795a5