Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fcb8b19f60af5d…

MALICIOUS

PDF

68.1 KB Created: 2021-04-01 06:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 633aec97d69b162a395940034fc058de SHA-1: 20bd913df4a28695e8d85bcf6b95fc128578bb98 SHA-256: c7fcb8b19f60af5de2aeb64481768c2fc2e582069068538118185b0e437c4bdf
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. This suggests the document is part of a scheme to drive traffic to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7003

Heuristics 4

  • 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
  • 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://soxebez.ru/award?keyword=memindahkan+file+pdf+ke+word
    • http://trendmobile.ru/72544545107dwivu.pdf
    • https://cdn.sqhk.co/dufukeraj/jbjbvDW/mixuravepe.pdf
    • http://helplnstagramoffice.com/16998322319yw8s5.pdf
    • https://cdn.sqhk.co/futevanu/FKribsg/mifexefi.pdf
    • http://umkatrade.ru/white_and_rodgers_thermostat_manual_1f80-361iw4o3.pdf
    • https://cdn.sqhk.co/virurewev/mge5if2/buborojev.pdf
    • https://cdn.sqhk.co/gijosevozu/gdHhgRm/91343731767.pdf
    • https://cdn.sqhk.co/pofifarim/6Sxshfu/happier_camper_traveler_reviews.pdf
    • http://theandyhong.com/35206315631ihoxe.pdf
    • https://cdn.sqhk.co/posukomokufi/qPjaWih/grammar_worksheets_subject_verb_agreement_high_school.pdf
    • http://testvvd.xyz/807630905004axff.pdf
    • https://cdn.sqhk.co/verexoleki/YNhjXqu/cartoon_lion_running_gif.pdf
    • https://cdn.sqhk.co/mawedabe/QjiUche/diversify_our_narrative_petition.pdf
    • https://cdn.sqhk.co/videgogaf/MjijcMi/lelarakibujuzesozowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_7d18c33335ce4f019fbfc51b619e0d18.pdf?index=true
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_7e654cefd10b4edd9e0a270946bcaffb.pdf?index=true
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_ec9c646aaba149ad89ceb8884ba31154.pdf?index=true
    • https://uploads.strikinglycdn.com/files/66a492ee-940b-4e9a-97f0-8b854501f098/what_is_a_scalp_cleanse.pdf
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_a98bc39d4d9d4241a9eca8da6fbd9d65.pdf?index=true
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_48d0249d3d434b3981871f7321472b10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/766cebe0-cfc2-45fb-ac02-4676f712df21/the_woman_in_cabin_10_chapter_2_summary.pdf
    • https://uploads.strikinglycdn.com/files/fae45678-4acc-4ec6-a3f1-26c19c9e2cc5/mechanics_of_materials_8th_edition_solution_manual_free_download.pdf
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_cbe424dc55cf47309ab7e85e14e292c5.pdf?index=true
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_994c459203624205889e162bb0d98ae9.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fd.bin
bf47b1005c5f2ce2e16292ab34c6a4c05585a09d492238a73967dd8e7792262a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 5264 bytes

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