Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dbc7b422ad8f55…

MALICIOUS

PDF

76.3 KB Created: 2021-04-04 04:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccad17159a0d74eeec85aa454be08b64 SHA-1: 8facba04e58c02809094d114ce295d293b25897c SHA-256: 49dbc7b422ad8f55f43c56167fa815bc4259a87db25704630b78e8dcd0fac788
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML heuristics flagged this PDF as malicious, specifically as a phishing or trojan. The embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8499

Heuristics 6

  • 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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=energy+policy+pdf
    • http://mibemuxagegija.mywebcommunity.org/disadvantages_of_food_adulteration.pdf
    • https://cdn.sqhk.co/loxowopiv/Y2VmEwn/campus_dean_parent_app.pdf
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/kutusi.pdf
    • https://kumevilowe.weebly.com/uploads/1/3/4/5/134598600/gobijixazibaz_tatef_kolukazetare_batilevizifu.pdf
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/38d6cdd54.pdf
    • https://lojuxilowexez.weebly.com/uploads/1/3/4/3/134321299/gazenokolozo-jetuwuv-ferizo-wolelitewiz.pdf
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/1047171.pdf
    • http://rezokivi.medianewsonline.com/syllabication_worksheets_with_answer_key.pdf
    • http://dibiwarisogix.mygamesonline.org/zefofewanutuwaved.pdf
    • https://cdn.sqhk.co/zivuputid/5L2ic3O/vemelezetavelox.pdf
    • https://cdn.sqhk.co/velabolo/D6gejeO/sniper_elite_4_cheats_pc_console_commands.pdf
    • http://gidepel.22web.org/spreadsheet_app_for_finances.pdf
    • http://gevotumawifal.22web.org/gurita.pdf
    • http://dabokopi.22web.org/nolusazixoj.pdf
    • http://tazizaj.iblogger.org/annex_xvii_reach.pdf
    • https://cdn.sqhk.co/keridola/fEVryIw/42025778890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sikegopivizegaw.epizy.com/31826001509.pdf
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_3f644d7719e2464ba0037566312f1410.pdf?index=true
    • http://sulijik.rf.gd/the_catholic_mass_explained_part_by_part.pdf
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_b23602336fad49cebcf297c202e7c329.pdf?index=true
    • http://tosowepexinuf.epizy.com/jagemikewunokesedexigo.pdf
    • http://womidelere.myartsonline.com/19807562023.pdf
    • http://jemukiguwuw.myartsonline.com/47830814227.pdf
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_9221dcabf4c943e7943bc15a41f3f3ff.pdf?index=true
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_736cfefce84e43d48ae7e58b92837468.pdf?index=true
    • http://xagugejubar.epizy.com/xezuruledewekumepidajo.pdf
    • http://potovoz.rf.gd/automatic_vs_manual_transmission_car.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_7a86e1c6db954d9283b24c5011141da0.pdf?index=true
    • http://xevojubalane.rf.gd/rejape.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f732.bin
6439d128cfb5041daec346a00fa532e4eecf60a26ed19d6053ee27147fb29658		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 4996 bytes
font_01_sfnt_off00010857.bin
3f7c7ee370276d4093df4eb80d8c9296abfc0816113022554b43167c695794f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 11408 bytes

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