Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4588d030a4c363e…

MALICIOUS

PDF

85.0 KB Created: 2021-05-25 18:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87fd5e5ccd50e8d0d5bf36d73a3737d9 SHA-1: 117047f9f7a6b0c0d4601f0a0ddba4cc26dcabb8 SHA-256: d4588d030a4c363efb78c07d1302b9a81eabe93d01d75606b436b78c548c76c3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9983

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://dugedepap.ru/strik?utm_term=blockman+go+mod+menu+apk+download PDF link annotation
    • https://xuzonikafu.weebly.com/uploads/1/3/5/3/135351414/4558948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410214/normal_5fcf336e942c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5ffa8e7ce7bbd.pdfIn PDF document text
    • https://perepori.weebly.com/uploads/1/3/4/0/134016710/jumewofebonol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_600b40fde09de.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/3090396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_604bb4016bf61.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/ligobafugepibeguja.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://uploads.strikinglycdn.com/files/68dadc5b-599d-4229-85fc-9e10ca50c839/industrial_craft_2_kinetic_steam_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4773b697-660d-4ed2-ba5e-1960d7221ba7/wopiragijinovojilumozo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/lapewetudefiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2001d7cc-0331-49f8-95ac-152cb5952cf1/16635759254.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/does_verizon_router_support_vpn.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/44647460928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a74292f-c4d6-4707-8467-063af8789e6a/91994629721.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/bleacher_report_los_angeles_chargers.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/27712840668.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/salen_and_zimmerman_2004.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/mathematica_5._2_free_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/81427895306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c028b512-43e3-4de9-ad27-d30e9a88e1f6/81469815192.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/87456183481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c640d8-03d6-4f11-980c-9ffad67a983b/soleus_air_12_000_btu_115-volt_window_air_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc2454a-2ac3-4737-bbb3-1dcf6e7f3662/10278614913.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 2912 bytes
SHA-256: ca76997379172eee33085c8482c7323aa4c6490e5d9b0518affecd078e7eaab7
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5080 bytes
SHA-256: 42c5080d3a9880d6273a972ffd1c488ca2eb41803fc554f376be6a628b9134cb
font_02_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16552 bytes
SHA-256: ee25746caec8f32bc2c56f319b7bb1d26de56e1fb469b8568dd8f8f38500b306
font_03_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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