Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc3aaadde8d8269…

MALICIOUS

PDF

80.9 KB Created: 2021-04-27 23:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5d8788394c349a9141f84f51b8ebee0 SHA-1: 69f40207cd89739f9a16340656533aa0fca24b2f SHA-256: 4fc3aaadde8d8269aef417a06529c2595f149fb67d103f2c0dba16a2abb42e95
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL 'https://golowaki.ru/strik?utm_term=english+dictionary+apk+full+offline' suggests a lure for a software download, which is a common tactic for distributing malware or conducting phishing attacks. The presence of external links and the ML detection strongly indicate a malicious intent to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://golowaki.ru/strik?utm_term=english+dictionary+apk+full+offline
    • http://blockhcain.host/53430844266jqvbw.pdf
    • http://japancar-sib.ru/kujejuruniwesenibamaresozlkm6.pdf
    • http://kyrgyztours.com/69380314229up0fx.pdf
    • http://onkoprofi.ru/wupodabopotelesavelarui.pdf
    • http://megatorg.ru/epson_printer_not_printing_black_ink_properly6y30a.pdf
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/somagakawu.pdf
    • http://womans30planet.com/bozujakukudapefowiridujiwqjuu9.pdf
    • http://idealicaitalia.website/90554226527fmj6r.pdf
    • https://ruxakidefo.weebly.com/uploads/1/3/4/1/134131713/930263.pdf
    • http://leoidet.xyz/shogun_rua_vs_nogueira_3nm654.pdf
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/kubusojiza.pdf
    • http://teenagetutor.online/57099986875xkb4v.pdf
    • http://copyrighthelpbusiness.net/download_cbt_nuggets_videos5eh01.pdf
    • http://xenuven.22web.org/prognosis_asthma.pdf
    • http://monubaz.iblogger.org/business_plan_template_app_startup.pdf
    • https://wepusetu.weebly.com/uploads/1/3/2/6/132695333/potobovasakam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuzamada/differential_calculus_in_economics.pdf
    • https://uploads.strikinglycdn.com/files/216f5f04-1e31-4e5c-9285-535cfbd8cd7c/27820490724.pdf
    • https://s3.amazonaws.com/fexuror/lover_s_concerto_piano_sheet.pdf
    • https://s3.amazonaws.com/luxelula/chinchani_mayakka_devi_song.pdf
    • https://uploads.strikinglycdn.com/files/97887bf6-d303-4788-a343-f7ab97f10bfa/labuzerelebo.pdf
    • https://s3.amazonaws.com/fomudebipefasu/2008_toyota_maintenance_schedule.pdf
    • https://uploads.strikinglycdn.com/files/4d913a55-d72c-4a0a-8b95-62424b2d0a69/89701585072.pdf
    • https://s3.amazonaws.com/jiwisi/story_saver_for_whatsapp_apk_free.pdf
    • http://risepaxazitomep.rf.gd/aglc_referencing_guide_deakin.pdf
    • https://uploads.strikinglycdn.com/files/c0881539-7ec2-4bae-9591-ffbacf9f092f/battletech_clan_terms.pdf
    • http://xuwewajefifa.rf.gd/judexiw.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_off0000ff18.bin
9014ab2a965db4bdfe05a3ee8886e64556ff5ac85260b123b8a129b5e2d4f16b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 5540 bytes
font_01_sfnt_off00011200.bin
2ece6affe915bec6020c0bd9e16e1ca8fbf68202757036c88b0f9c080551af2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 10464 bytes

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