Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad2b30ee37c48d9…

MALICIOUS

PDF

74.9 KB Created: 2021-02-26 12:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ef0478af519d684c42f0861219c820f3 SHA-1: 47d0d4451022d71adca5a278d7f67950e79bdb85 SHA-256: 6ad2b30ee37c48d990adf9098e22905758f5b88f2c92bab38ca1c189956310f0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing this assessment. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=why+we+need+universal+design PDF link annotation
    • http://free-at.pro/nigovejajijutugi7eakr.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/85094474060.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/93841424230.pdfIn PDF document text
    • http://hookup157.site/euro_truck_evolution_simulator_mod_apk_v3._1de47j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6025bbc20b04c.pdfIn PDF document text
    • http://stylecurtains.com/24088820015rsh8.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/jedunamisudujufevu.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/towuvowomazalpw7r1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_5fed3ffed1fc9.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/libro_de_metodologia_dela_investigacion_cientifica_sampieri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/texas_cdl_training_handbook.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/how_to_read_molecular_structures.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/45697006926.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/how_to_get_the_average_atomic_mass_of_an_element.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/59833115341.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_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 5356 bytes
SHA-256: a0e14bc70753ca0ca39cbff94ed379d84e1b3b5697455052f5d22ca43204059d
font_01_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 10488 bytes
SHA-256: 72906e4d7371d208960c8abb8a9542ac09d2fd408927f3b2c782166b85b0d783

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