Malicious PDF — malware analysis report

Static analysis result for SHA-256 4069da2473477d5f…

MALICIOUS

PDF

83.7 KB Created: 2021-03-06 13:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f37b8f9326d9a5629a54532d04431c67 SHA-1: 233265c64f0e3cd69cbb3fbe96820fa4f249f1c9 SHA-256: 4069da2473477d5fdbbd0b53a123cf6db20b70577289195ed3572b1239b26359
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting a deceptive title to encourage downloads. It contains a large number of external links, many hosted on disposable domains, indicating a probable phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=group+theory+mcqs+with+answers+pdf+download PDF link annotation
    • http://likozibave.iblogger.org/wonderwall_projector_owners_manual.pdfIn PDF document text
    • https://sejukato.weebly.com/uploads/1/3/4/0/134018084/fafunewadelewi.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/gi4d6jj/33425456259.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/Gyjgigi/dategudavukorepuregila.pdfIn PDF document text
    • http://gifozazupu.iblogger.org/26045609853.pdfIn PDF document text
    • https://samitezoderedo.weebly.com/uploads/1/3/4/4/134488512/8267261.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/momoxazageze-kufomojo-wumovexote-rutoge.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/tugudoluzuzu.pdfIn PDF document text
    • http://vagivosifogezer.22web.org/56695093163.pdfIn PDF document text
    • http://pesuzukotejoki.iblogger.org/solution_calculator_molarity.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/hrgjfIA/squadra_fast_and_furious.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokatesexoli.epizy.com/lodge_cast_iron_recipes_cornbread.pdfIn PDF document text
    • http://mafofeguf.epizy.com/ielts_book_8_reading_test_4_answers.pdfIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_c87c3662b6d449ae8a95b24ff775e2d9.pdf?index=trueIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_f9f43138abb342b09a90c3fc5cf5216f.pdf?index=trueIn PDF document text
    • http://zetesapoxus.epizy.com/mosada.pdfIn PDF document text
    • http://gekavitominugi.epizy.com/mapaferokidutazafuwi.pdfIn PDF document text
    • http://bowupezik.epizy.com/apocalypto_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8659de-76b2-46bc-8689-7c3374ae1366/fipokutet.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_759125a6c092432ebae4ca6d7fa78a93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43f1da7-2b75-4196-926e-c879da3d0649/vizio_sound_bar_specs.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_10128ba86eae41fe81d303e6c1a84c62.pdf?index=trueIn PDF document text
    • http://nobegik.rf.gd/excerpts_from_the_jungle_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 5744 bytes
SHA-256: 39055caed65569fbfc1e35873dc546088c1d13997c05118280481ef8d32c0367
font_01_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 11180 bytes
SHA-256: 5d21ad1f77fdbd99a0e2bf85bbd1faa155c94994cd20b38a97c12c25f5f23565
font_02_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 16204 bytes
SHA-256: 77c1e2e27a997a0d0fd71190a450cd26356e151edb8e4e837282ae869a63ff73