Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a78e9061151943…

MALICIOUS

PDF

73.2 KB Created: 2021-01-20 08:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ea036d30f77313a85a5633e80c2538e8 SHA-1: 4ce558cb9a95c335f706dfee05c068cd20f8341a SHA-256: 92a78e90611519434a7abf12f2bb8e601bd6812150ed06767fe2084b4d15fd25
164 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it is designed to host numerous external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various PDF files, suggesting a lure to download further content, potentially malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/aws?utm_term=12+half+yearly+exam+answer+key+2018 PDF link annotation
    • https://cdn.sqhk.co/weruvewo/ibibyov/brasfoot_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/jhKjiid/6712576779.pdfIn PDF document text
    • https://lodobapidadisu.weebly.com/uploads/1/3/1/1/131164557/mexiku.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/s6qzgcG/21096133435.pdfIn PDF document text
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/fekimizati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366384/normal_5ff407f3b1362.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/djh9A0F/dark_humor_riddles_with_answers.pdfIn PDF document text
    • https://lebetazukuz.weebly.com/uploads/1/3/1/6/131606644/333a0398664e2.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/7YJW7hh/58253555973.pdfIn PDF document text
    • https://cdn.sqhk.co/puwetudul/bibijjB/thermaltake_h100_tempered_glass_mid_tower_pc_case.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/dibjhif/hello_kitty_carnival_background.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/hhhgiia/pokipewigijogobom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5fad9dba6aef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5ff463a3f299d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8ae5fe4759c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/forupokisip/shawn_mendes_concert_2019_houston.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/corpse_party_blood_drive_chapter_3_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/free_eisenhower_matrix_template_excel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 5308 bytes
SHA-256: 5b5c06d1ffb1256d8b7f1d314173035a370eb956ad75173e18d67461594c646b
font_01_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 10340 bytes
SHA-256: 9481b90e6055350511f38bde575b31cc4ede748e171f048d62b4f8907c57c756
font_02_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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