Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d748cd2dcd90177…

MALICIOUS

PDF

78.9 KB Created: 2021-03-29 12:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0aceec683858bc0faa9b11f97c1e6ef SHA-1: 7fb7028136c4d92669c371cfbfcf819deef995cb SHA-256: 0d748cd2dcd901774a96b18c5298a4e535e0668d68bc860fe642b0bec3ff69e9
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a 'PDF_SEO_LINK_FARM'. One of these links, 'https://vilenefex.ru/strik?utm_term=will+soaking+in+bleach+kill+toenail+fungus', is embedded directly in the document. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The combination of these factors strongly suggests a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=will+soaking+in+bleach+kill+toenail+fungus
    • https://cdn.sqhk.co/kaxonavi/ihjhue9/44253163337.pdf
    • https://cdn.sqhk.co/vetukalujir/oLjcStS/39530413064.pdf
    • https://cdn.sqhk.co/jogujufuza/cVywbja/the_color_tunnel_birmingham_address.pdf
    • https://cdn.sqhk.co/lexaxemiji/bg7Ahhf/xipototus.pdf
    • https://cdn.sqhk.co/tefulobesa/aMieggi/mo_salah_messi_advert.pdf
    • https://cdn.sqhk.co/venifirub/jgjirie/movie_director_simulator_pc.pdf
    • https://cdn.sqhk.co/sebixodof/G5yYkgd/empires_and_allies_mac_download.pdf
    • https://cdn.sqhk.co/busumodofu/ghgjjjj/grand_theft_auto_iv_the_complete_edition_ps4.pdf
    • https://cdn.sqhk.co/wizokawoxo/sUjjUOp/aparichitudu_telugu_movie_audio_songs_free.pdf
    • http://tapikival.22web.org/edit_for_mac_free_download.pdf
    • https://cdn.sqhk.co/zezinojox/hijdhir/wolf_sound_ringtone_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_abd7b7148ca44fb88a27e2aae8d4b027.pdf?index=true
    • https://s3.amazonaws.com/woxotopapozokev/97381458930.pdf
    • http://bebakujudofofel.epizy.com/guidelines_esc_heart_failure_2016.pdf
    • https://s3.amazonaws.com/jojitagifuva/38231759752.pdf
    • https://s3.amazonaws.com/nisoxow/dolaxizisimanavaponam.pdf
    • https://s3.amazonaws.com/fezenur/barbell_shoulder_press_proper_form.pdf
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_cac8d411809d4581af07559fdce117a9.pdf?index=true
    • https://s3.amazonaws.com/nefomojuwet/rutilibiw.pdf
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_3a7894383c92418eb531d888e5024c38.pdf?index=true
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_17d0d98a7561453983713f61d123f96a.pdf?index=true
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_19b3ed101a674deba947757a8125a1a8.pdf?index=true
    • 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_off0000f780.bin
9955aeceec8473f74de80865bfa49a96ee16eacfeb741bbc4ca189d5e8c08270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5264 bytes
font_01_sfnt_off0001097e.bin
2f691221282b77bd0779af5941f6697fe61baefb89ae607416c3e692339d9b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 10804 bytes

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