Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8d1dd937f91418…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 22:25:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2236eded4f2703f7b325598cac39a051 SHA-1: b06ca43e86da84fe9a64dc77aee63114aa9e4328 SHA-256: da8d1dd937f91418eab8721353db9c2c5d98f04860a612fc051fe08b5102ea85
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs, https://mezovuduw.ru/award?keyword=ley+general+de+cambio+clim%25C3%25A1tico+2020+pdf, is likely part of this malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect users to potentially harmful content.

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.
  • 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://mezovuduw.ru/award?keyword=ley+general+de+cambio+clim%25C3%25A1tico+2020+pdf PDF link annotation
    • https://deledixedebudon.weebly.com/uploads/1/3/4/4/134499708/sirajusedo_piredi_zosiwexijoku.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/BWjhgjy/cute_cartoon_animals_wallpapers_free.pdfIn PDF document text
    • https://tefafovok.weebly.com/uploads/1/3/4/5/134588422/fbd59ba823d.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/hhfSshg/36164074739.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/hhiiKhb/kixizukovuwidij.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/chbjajh/samsung_dex_note_9_windows_10.pdfIn PDF document text
    • https://vibajadulefunuk.weebly.com/uploads/1/3/0/8/130874079/5467174.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/6497454.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/h1oZWji/simple_electric_circuit_differential_equation_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/gdaiaij/nisimigin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_b789e430b0884a1d8140cd3b9e8a2209.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f221ab-fb45-4cf9-8625-b01ca4036f66/85734754224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909f487e-0238-495f-bc7f-1f796c046157/los_rios_de_color_purpura_2_1080p_latino.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_21bcb84890b14d9cb4eea1f885ba10f1.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_6ed5825a655743b3adae312cda92d114.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_c53ba44057914cf4b57c2a97b9e505ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8039bcb1-92e6-4270-9c52-306102a22448/i_want_to_walk_as_a_child_of_the_light_piano_sheet_music.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_eedb96983f6548be9a3a290e89252155.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_fc9ccc9b3d1f403f9f048a6d2b6f7650.pdf?index=trueIn 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_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 5988 bytes
SHA-256: 603b53a99b9370ddd6e6eb6b6d329696ce2f788bc65421b509b5b00eb6c80d65
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 11408 bytes
SHA-256: f196280bb0ea021654957f3c2ee89e703d6a0a58b1379f994e1297d47de78420