Malicious PDF — malware analysis report

Static analysis result for SHA-256 a727dd025dfa8a2b…

MALICIOUS

PDF

70.6 KB Created: 2021-03-27 22:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ecb8f11c20003d828c09e1429562cf0c SHA-1: 6dfcfbb8acd0fe5336386fadbdd6b3ee3636ae60 SHA-256: a727dd025dfa8a2b4c3f0cb3d3eba59c6df4980656fb38ad962d8fbaf9cbf73f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a crossword puzzle, aiming to trick users into clicking malicious links.

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://pelibifir.ru/wix?keyword=brave+new+world+crossword+answers PDF link annotation
    • https://cdn.sqhk.co/rowalulo/DjjAhb4/medieval_period_war_horses.pdfIn PDF document text
    • http://mejuzuw.scienceontheweb.net/performance_evaluation_template.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/pidhbja/soxobubagupi.pdfIn PDF document text
    • http://nutapobo.iblogger.org/20174137728.pdfIn PDF document text
    • https://cdn.sqhk.co/pivatiwon/SgiAjev/clinical_anatomy_of_lower_limb.pdfIn PDF document text
    • http://bogplaktnc.fun/626839687793v0yq.pdfIn PDF document text
    • http://passive-income.ru/18622106396g2epz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_601dc277ae187.pdfIn PDF document text
    • http://instas.site/zojogaxexuialty.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/2700212065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_60349600ec264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_605994cdd6c01.pdfIn PDF document text
    • http://wiwusigeronisu.66ghz.com/nsw_maritime_incident_report_form.pdfIn PDF document text
    • http://redit.fun/13058799298l68xw.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/pogimenisurinefofojid.pdfIn PDF document text
    • https://cdn.sqhk.co/felibepudu/bMB15br/automower_315_connect_module.pdfIn PDF document text
    • http://jonezuno.22web.org/amu_11th_application_form_2019_last_date.pdfIn PDF document text
    • https://cdn.sqhk.co/zakikola/haWjjgf/wumipegibatopol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejegekobo.rf.gd/abbottabad_commission_report.pdfIn PDF document text
    • http://xotopusedewix.myartsonline.com/mecanismo_de_ao_do_captopril.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/st_banjara_song_audio.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 5136 bytes
SHA-256: b1e11433f99b7bcbf814373b44863bfa75cdf0150037e0bffb6fcf4b12166231
font_01_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 11588 bytes
SHA-256: 8d1c5f1c9857543a5d10b3a7e24aae287793e069c3ad0f529dd638c3844e6bec

Open this report in the interactive analyzer, or submit your own file for analysis.