Malicious PDF — malware analysis report

Static analysis result for SHA-256 a562b7d9bd0f0102…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 06:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef8736c90f1755e2042e8f641060d62f SHA-1: 79fea6609d11dffbb8fc1f70687d9b1947e4002d SHA-256: a562b7d9bd0f0102ef46513c229acfbc12348cd6867b083043012a5a15b106b2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a link farm heuristic, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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://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://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_off0000f5fd.bin
bf47b1005c5f2ce2e16292ab34c6a4c05585a09d492238a73967dd8e7792262a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 5264 bytes
font_01_sfnt_off000107d7.bin
543067b19646f92dd6c11f5e5f3a21b4d7e10242f89e0ad6922ab98bd03414a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10348 bytes

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