Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0a91fe415b18d3…

MALICIOUS

PDF

91.4 KB Created: 2021-04-01 22:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c4541d3808b92ccc859b040c69d886ba SHA-1: 287b1814a630154d317f4e3ae305ce8cb82743c0 SHA-256: ba0a91fe415b18d307de0f3147fe29a4abc1723760df2016af6b8bbbacf840c4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs and the overall structure strongly suggest an attempt to leverage SEO or phishing tactics to direct users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://baarspo.ru/strik?utm_term=senior+designer+salary+los+angeles PDF link annotation
    • https://cdn.sqhk.co/loganidob/ODKijfv/marketplace_appeals_phone_number.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/kakojupezorefidaw.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/xuzakuwikidijiz-dixikusujowuwag-zovejokur-suporebuput.pdfIn PDF document text
    • https://cdn.sqhk.co/zeragekub/8ijMQEI/32597301369.pdfIn PDF document text
    • https://cdn.sqhk.co/dozumapufa/dMxSCia/durosutarewelatowir.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/samsung_un32eh5000fxza_manual.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/18896097682.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/29545326179.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/odisha_govt_treasury_challan_form.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/hejf5jc/web_design_flyer_template_vector.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxifopu/fhavgiK/blue_bottle_fly_pupae.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/nanokinoximojigutofugemo.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/e5efae68-77b8-4019-b639-f33fe8edf03c/a_prayer_for_owen_meany.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/mt_elbert_forebay_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c756c8-0f53-480a-8dbf-fac9581c1225/logitech_z_5500_speaker_specifications.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_0517ec80db594921996354f0ffd30e3d.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_339a666b487a4e46aecfc9316b724057.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccc33b0-2f71-4a67-b082-55e21907af4c/kowesonunezew.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_c4a1ba494b064060b6ab194058f78554.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xelimewat/39011090538.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_3b71d69f20a149ba92a2f7450d4ddf4d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 5196 bytes
SHA-256: 94ae843e78db216b168d27014d185e10d9590109f3ff4476a457d733cb461222
font_01_sfnt_off00013a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4F 11300 bytes
SHA-256: adbe8ea24d97b704f56a5bff1a59f966894cfbf71c6551bc59ffc8776e34b87c