Malicious PDF — malware analysis report

Static analysis result for SHA-256 f552ad00b2a71b89…

MALICIOUS

PDF

70.4 KB Created: 2021-04-04 23:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 086c4ff310ca4372a43e7514561e0dc0 SHA-1: 717e367dd882bfedea409111ee0b6c75ba7adc6e SHA-256: f552ad00b2a71b896836877ea8a34f7e011c83a89585675198c5e29c2695298d
166 Risk Score

Malware Insights

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

The PDF document contains numerous external URLs, with one specifically flagged as a potential lure for malicious activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially instructing the user to open a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/award?keyword=carson+dellosa+pdf PDF link annotation
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/gijinagosege-vudugolirerizax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_606778db04c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_6062d16c88d60.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/computer_hardware_book_free_download_bangla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_602e66b6864cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fcb1d6ddd218.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/2270752.pdfIn PDF document text
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/35dc19b9b.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/remeranexe/sql_server_dba_tutorial_beginner_to_advanced_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77d3346-1fa5-412c-a92c-212e0c877b01/doxukevesave.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_f33211e0e4fc41799b5c4cd4c793419a.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_cdb8aeade56349759b365b1a229ffcc8.pdf?index=trueIn PDF document text
    • http://vapewokadovusa.myartsonline.com/wuxasufezefevufuwejinob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dda2f3f-2369-4541-ab79-cb27d56bfdd1/boyce_elementary_differential_equations_10th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/degoxusokugolumo.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_c1d6dc7fc76e4f2996d61269aa8551ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0f8be9-59ee-4763-8afe-53dd95bd5f72/27723217120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3c2c23-2c5d-44a8-9046-46f506fde3a9/what_type_of_chart_might_you_use_to_collect_data_on_frequency.pdfIn PDF document text
    • http://vefodipox.myartsonline.com/41822002947.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/adding_and_subtracting_fractions_activities_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/56642827727.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/a_tres_metros_sobre_el_cielo_reparto_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91eaf95b-c79c-4297-beeb-94ed257e3a98/what_are_examples_of_visual_cues.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 4940 bytes
SHA-256: df6f1efda763efb701dffcbb9423c3ca8e2e22ca526852aa66d744c3511fe74a
font_01_sfnt_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 11560 bytes
SHA-256: 3aa97c6ad7f1bf4eac2fb61542d5c2cfb0ee79021652f09064f420e764f9c5a6