Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a989f8d41268ca…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 16:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c79f9f9a65ec9cad8ae2d0f614acbf3b SHA-1: 893bcbf1e001338697cf5a0bc6fbe1a34ad7dddc SHA-256: 93a989f8d41268ca75ecca51f3c57f9a8d69271165d36af4d3c6311a275bdb75
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=acer+aspire+won%2527t+turn+on+unless+plugged+in PDF link annotation
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/3673170.pdfIn PDF document text
    • http://dejamorije.scienceontheweb.net/asana_pranayama_mudra_bandha_free.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/9290948.pdfIn PDF document text
    • https://fusidaxeda.weebly.com/uploads/1/3/1/4/131453850/tebetuzetanebo.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/vezigizagefo_ribuwopuvawo_xomulojononuv.pdfIn PDF document text
    • https://vabofofed.weebly.com/uploads/1/3/4/3/134337048/wedutiletubetazorobe.pdfIn PDF document text
    • http://vitonidero.medianewsonline.com/xiwivagamefumino.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/rewusatodoka.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/1390598.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/fb45adbc-a285-4af1-857c-31c6516dc27f/how_to_do_aa_meetings_on_zoom.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/fast_way_to_get_rid_of_feet_smell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0545bd2-b737-477f-b8f5-a8d043bcd4c6/best_resistance_bands_exercises_for_abs.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_84c1697894f247b2ba17717764976d94.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_44a176c06a66483e8c56d15bb56c965a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/85331871192.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/american_harvest_snackmaster_dehydrator_user_manual.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_78ffe538d79142a0a336dd517079c866.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/proper_address_format_netherlands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a33b47d-8513-44f2-8504-6ae91bb98733/breadman_plus_bread_machine_manual.pdfIn PDF document text
    • http://zimopup.myartsonline.com/30399982126.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/34154803229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/161db98d-5362-467f-8a31-3f8bf36464d0/what_is_the_first_book_in_the_selection_series.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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5356 bytes
SHA-256: 90b26ac2baca414902f33b9699ef07f43d889ecebd151ce7415ad369fff28a72
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 10844 bytes
SHA-256: 3f08bbcae083b30504cb5da1741763c42a3550e5dc5032e341dce1d74b0cabfa