Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1f310ddcb7b3ab…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 13:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3484fa610d5c3f74221084d439e89932 SHA-1: 41863dd1a5486764f93ed80ed0c90cfd696b5342 SHA-256: 6f1f310ddcb7b3abaf51d73c54cee88dcae463c44ff72a10159094fd91125b86
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML_NYX_PDF_MALICIOUS score is very high. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=blue+dye+procedure PDF link annotation
    • https://cdn.sqhk.co/bimerolu/igtjjgd/61996008188.pdfIn PDF document text
    • http://punejew.mygamesonline.org/aceable_driving_manager.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/98049496247.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/kJTDFja/the_wolfpack_movie_soundtrack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_60226e236e4ff.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/5zThid1/puxixutejaligikake.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/multiplication_times_table_chart_1-12.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/greenhouse_agriculture_technology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_605db75c78885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5fd6cbbf17439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5ff07ae8179b9.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/fMgdijl/game_sticker_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/ihjcijS/bhojpuri_video_20183gp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482424/normal_5fe41baf47557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofalit.myartsonline.com/80919041889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478efb52-edfe-4483-9e5f-ab6ab4e95243/6042913567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d665e197-bd3d-49f4-a781-480d2b28f64f/5971275331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755836b6-02b8-445d-8ac2-e6729c76d3a4/faxinuzonomib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56458318-7727-4be0-995a-e7142acc97fd/83194275103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5d0222-0ff8-4bf9-af35-843ca2d98b63/are_james_allen_diamonds_lab_grown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63047c74-0ef7-4869-a067-9e810a0d8800/41042856452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15a124e-d447-4c7c-a3e4-bb83b71fa207/noco_genius_boost_gb40_how_to_charge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbda0f9-ea3b-4c9c-8a8d-336e670cfb52/rutejinosevedofekujezeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed5862d-63fe-456d-8c10-c44feda5b8ac/vba_programming_tutorial.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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 4832 bytes
SHA-256: d431b0a92f0649cb60e5bde34505688ac5f764a570088abc58dc276f71e9eb1a
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 11624 bytes
SHA-256: a26803c400fce25260008569a305e46e022bfcec05ea4e8f88145e0368dea852