Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d60528a33db48ae…

MALICIOUS

PDF

74.5 KB Created: 2021-05-22 04:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4444f54719be4197c17d56096f8bb11c SHA-1: 9d733d4d8da3b8902c49240e0bb09b8016b06f49 SHA-256: 4d60528a33db48ae2c5eec191ba164d111896134aa781dab09b8ddebd494f1bf
186 Risk Score

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-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://zajinet.ru/strik?utm_term=improve+handwriting+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470542/normal_60519a48444d9.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/retekizomesivujetode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_6038d63aa2d9a.pdfIn PDF document text
    • https://dabekigojevuj.weebly.com/uploads/1/3/4/6/134636423/0a218425.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/6961476.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/wimuvovegaja-moken-motixilozuwafo-balividoxiwoj.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/sinixerezibiset.pdfIn PDF document text
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/4386654.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/1533754.pdfIn PDF document text
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/1046299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60339c5527ccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_604e4e574d23a.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/42d930bc-4c05-4cda-8e63-0226e59678f0/damned_human_race_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc57b4a-fe65-45a3-ab62-dc2c6fb482c2/foxametedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b7bfef-731c-42aa-8537-00dd2e9c90d3/95711946602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/989518cd-7c10-4fe8-9988-1ed2073e8a43/nikon_l35af_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba97d035-92d0-46c8-aa67-0311e02d69d9/manovofikelotalor.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/how_to_tell_ge_water_heater_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821de349-b5cd-453c-92c6-0fced1167d7e/75681967241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bf354f-4a13-4afe-a6dc-1890f0fc303b/how_to_find_the_amount_of_atoms_in_a_chemical_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2414c7-6478-4934-9653-7232de6c4b03/pokemon_xyz_episode_in_hindi_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/17414817299.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/rosixupumami.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5576 bytes
SHA-256: 23e7ff4433ab841d08c5b742cbc55efd2fbd78488a168086caec5f7c0ddd94f2
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 10768 bytes
SHA-256: eadcc56e49136366136909acac461b124788a34f718d9b530f457e6771f0aaab