Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b535c7f6873fdc6…

MALICIOUS

PDF

70.0 KB Created: 2021-04-19 12:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7505f17cdb7522021f3c671675c5668 SHA-1: 9650ee5d34acf0816529583142f503d424d224e5 SHA-256: 9b535c7f6873fdc6f766ef5729c0e8dfb51e31de379289addbe3ef0994f0d0dd
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, indicating an attempt to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the 'ML_NYX_PDF_MALICIOUS' score strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a common PDF-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=2017+chevy+malibu+led+tail+lights
    • http://aazzzry.space/how_to_make_a_starbucks_frappuccino_with_coffeehqtny.pdf
    • https://cdn-cms.f-static.net/uploads/4387939/normal_603d7ceb948a2.pdf
    • http://henrysavbr.site/bobevotijugun1wlf.pdf
    • http://onlinetyz.xyz/8444098043146lm8.pdf
    • http://matrixbicycles.com/dig_your_roots_meaning60r37.pdf
    • https://static.s123-cdn-static.com/uploads/4401559/normal_6002fb0497a49.pdf
    • http://bezprovodov.guru/confession_of_a_shopaholic_book2xwgx.pdf
    • http://vuvigurozinuro.iblogger.org/vozaponanaxomisifib.pdf
    • http://smeh-mif.space/booyah_meaning_in_tamiljfpqa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_de7b2c3bb51843608c39d13a58b7e3b6.pdf?index=true
    • http://tesalivolanimeg.rf.gd/63403983489.pdf
    • https://s3.amazonaws.com/mijumomub/adding_yeast_nutrient_during_fermentation.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_0496a674745c492bb7164bb569833390.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/attendance_list_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2af.bin
b7e3f1d01616ceb4547376dfa133e6f4a0841dfafdbfd1463105dba09c83f60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 5872 bytes
font_01_sfnt_off0000e692.bin
015fd2d03e29710df0b6156c355c976db9765eaac0d35b260ec38e6c9105c20c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 10824 bytes

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