Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8db08b5137ea03b…

MALICIOUS

PDF

74.0 KB Created: 2021-05-05 19:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aee383a109218d643658cc8cd8bed47a SHA-1: d5a62f70e68ac3548d6c7551f6064f5a5175ed13 SHA-256: f8db08b5137ea03be98749655ca7316f63dbdadc68fa2ca0032b6eb99c0d30d4
136 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating suspicious and invisible links to external domains. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it might be a generated document. The presence of multiple suspicious URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://xezojetit.ru/strik?utm_term=john+deere+d140+parts+manual+pdf
    • https://cdn.sqhk.co/raxoxawupej/jdK6heS/star_wars_galaxy_of_heroes_rebels_event_hard.pdf
    • http://ig-supportcenter.xyz/social_science_research_meaning_and_significance6hrga.pdf
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/sidefi-tofos-dukogogosugun-kikudolax.pdf
    • https://cdn-cms.f-static.net/uploads/4426547/normal_60322cfe21b6f.pdf
    • https://cdn-cms.f-static.net/uploads/4370989/normal_603b3e2633b0d.pdf
    • https://cdn.sqhk.co/madufuxenuw/Cmpicgh/kaberiberivukufevev.pdf
    • http://trelon.fun/what_does_the_international_law_commission_do26wxm.pdf
    • http://static-get.top/how_do_i_fix_my_toshiba_tv_that_wont_turn_onw8v6h.pdf
    • http://shopsupergood.site/85977757794ahrr5.pdf
    • https://lisajakuxateril.weebly.com/uploads/1/3/4/3/134349263/d13e07e7bec62.pdf
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5fdd8df4ccec2.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5fd84f8b55666.pdf
    • http://boevoenlp.com/49090256062ntyyb.pdf
    • http://logmeinnow.xyz/how_to_magic_with_cards_easyh387v.pdf
    • https://cdn.sqhk.co/nuxoporerom/hhujjhh/allegiant_customer_service_telephone_number.pdf
    • https://static.s123-cdn-static.com/uploads/4529893/normal_5ff65e5d511ad.pdf
    • http://itali-big.space/91982226257v9k3u.pdf
    • http://natikolom.site/senavujinuiot3i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e25b.bin
747f220fdc15a9d1416ae72dcf20c415a38a64579cadf3e9a12bd3935fd6803e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 5552 bytes
font_01_sfnt_off0000f514.bin
26350722866de9651a2eb7ffb130d86ecefe1bf6d4ad4860da96091ebb19b183
pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 11104 bytes