Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7917b024de7b9af…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 21:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 657496088928daecd04cfd9859c13229 SHA-1: b146f4f1f4dacb0901a279f6a71cccf4d3e7416a SHA-256: a7917b024de7b9aff0996dcbf0a9dd49fabe7b59225318330fdffb921601d59e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score indicate a malicious document, likely designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=turkish+etymological+dictionary+online
    • https://mafupixalikufu.weebly.com/uploads/1/3/4/6/134662523/raxuxux_vowiwakuzi_nutoludikes_bijesal.pdf
    • http://bubuwem.iblogger.org/human_trafficking_in_the_united_states_2018_statistics.pdf
    • http://fulisipojuzobog.22web.org/mofogijupat.pdf
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/rawerajajogamazosax.pdf
    • http://bluebadge-support.com/74417901175ipi1q.pdf
    • http://tufataf.22web.org/acrobat_reader_10._1._3.pdf
    • http://naturaitalia.space/reddy_heater_pro_110_repairu43yf.pdf
    • http://opensol.xyz/dev_anand_movie_guide_songs4pdn0.pdf
    • http://afracheat3.xyz/48203633889w00cc.pdf
    • http://prizinsta24.space/33773252111de3s9.pdf
    • http://xepidenad.scienceontheweb.net/96752813433.pdf
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/9152831.pdf
    • https://cdn-cms.f-static.net/uploads/4503309/normal_60469f4558af7.pdf
    • https://static.s123-cdn-static.com/uploads/4405674/normal_60089ca08744a.pdf
    • http://dokakepitizix.medianewsonline.com/star_wars_incredible_cross_sections_attack_of_the_clones.pdf
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcaa605162e4.pdf
    • https://static.s123-cdn-static.com/uploads/4451356/normal_5fcf60a828888.pdf
    • https://dedetalorisa.weebly.com/uploads/1/3/4/5/134593476/5a5b35007aa.pdf
    • https://cdn-cms.f-static.net/uploads/4386366/normal_60482e90c86d3.pdf
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/soxipezume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/novifamigot/xibamesisexutezejiwudane.pdf
    • https://s3.amazonaws.com/suzujewa/the_burning_maze_epub_free_download.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/51102769956.pdf
    • https://s3.amazonaws.com/tuxutedi/calligraphy_alphabet_font.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_off0000f400.bin
c206bf418ed9d4d6ac311fe0d3172ab661d04d532ff2a531c2037f9ab1d11838		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 5468 bytes
font_01_sfnt_off00010677.bin
ac64025ba22a02449c7b299d7f3e17a4d1e1794cc6cd2907ffa0e9214928eda1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 10184 bytes

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