Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cc66e3bd8a6f2b…

MALICIOUS

PDF

79.2 KB Created: 2021-05-15 22:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae440048d9fd0b39160d4fb9bc79283c SHA-1: 805f540e8a95047317d6f1d4b177870f6afa5a03 SHA-256: 39cc66e3bd8a6f2be83907ff8a612d71b4bf09782c6fe90d0a5aaad3001cbab8
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+read+weather+station+symbols PDF link annotation
    • http://effektzhizni.ru/toxogewigaze9om6y.pdfIn PDF document text
    • http://senigudalow.iblogger.org/24604528344.pdfIn PDF document text
    • https://depuxozepol.weebly.com/uploads/1/3/4/3/134377374/ronejepaped.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/cefr_sample_test.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/58055846968.pdfIn PDF document text
    • http://rocketdocs.us/jixopukenetinatopasapodsaujm.pdfIn PDF document text
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/5730548.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/684486.pdfIn PDF document text
    • http://loveantravel.xyz/3628049273ac1nx.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/ejercicios_gramatica_b1.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/5199012.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/mastering_swing_trading.pdfIn PDF document text
    • http://zirosax.iblogger.org/despacito_tune_ringtone_mr_jatt.pdfIn PDF document text
    • http://izzzaaa.space/49990158694uvz0r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisisome.rf.gd/bts_love_yourself_answer_era.pdfIn PDF document text
    • http://vosujepagukag.epizy.com/wofonekamexenixagolof.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_22d7f920d993422bbd7b9320ce0dd0b7.pdf?index=trueIn PDF document text
    • https://c0add167-8731-41f0-9a7b-3d62f09b0499.filesusr.com/ugd/879476_4964bb3aaf2f4803bebcf5ec4c975ff4.pdf?index=trueIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_4d186c6cd9fd4f078c07160bd7b4954c.pdf?index=trueIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_39c13cf2d8614f47aff1feb47d905163.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_e8377262740a46d785f51698e17dfeb6.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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 5360 bytes
SHA-256: fe64b32b9c808883e5b5b2083528a11c5040b2a4d271272fa0f9b595b2b21e7b
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 11136 bytes
SHA-256: 5aa135de14bf1a0423e39a6ae2e463768361ce091fe71a264b4dd506b341a25a

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