Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cf1ff1b507b243…

MALICIOUS

PDF

69.1 KB Created: 2020-12-07 13:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6196294e1be87a6b790ef4b2d1ba62f5 SHA-1: 9f02425661f58c1a720ea6fc3f339e3a51da2a8f SHA-256: f9cf1ff1b507b24328c28d3e7bff69e1c1e918ed4a2c0a80e2c968409b32c221
164 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. It uses an urgency-based lure. 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 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/strik?utm_term=maternal+newborn+nursing+care+plans+pdf PDF link annotation
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/9453160.pdfIn PDF document text
    • https://jemajodelevo.weebly.com/uploads/1/3/4/3/134394711/5330996.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/folupu_pajuxawoxetesim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f8a0d0486115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/manualidades_navideas_para_nios_faciles_de_hacer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39de844-011f-4011-9c8a-a4922fae5a57/52493822706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfbcf5f-ea3f-4422-a719-83e68a2b3f30/32448311415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dc6d50-5ce2-4ce9-bc4f-4680060537da/zepunetixufikejasizat.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/take_this_sinking_boat_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a79ab0b-863e-475a-8559-1dc1e4438db3/your_pinoy_tambayan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b6026a-c4b5-44c7-8c16-510010e4b82b/design_methods_in_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdcec23-8e08-4afb-a827-2aae13ccfbc9/el_libro_de_mis_oraciones_catolicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6844b951-f201-4fb4-90d1-654030db56a3/jiwiwedubarino.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38c0cea4a794d5655cf02/t/5fc63f1a61e25426e10c7a83/1606827804363/cat_with_runny_nose_eyes_and_sneezing.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_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 5560 bytes
SHA-256: 01b7f2972f29a4b5368493740ae9eb4e8e53878aa4b7b5d2cd2eab65a58f37eb
font_01_sfnt_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 10788 bytes
SHA-256: ad02fabff45cb836f9bf5bc1d8d36f318579e87ad8827d91c877496d481b82db

Open this report in the interactive analyzer, or submit your own file for analysis.