Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a63c898f0b81614…

MALICIOUS

PDF

82.6 KB Created: 2021-03-20 00:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ebc0317cab4853cf3d6899a84b3f475f SHA-1: b4df058ef7d10d8d78585472c6cb8a0f01922821 SHA-256: 6a63c898f0b816142ad0dccf9c8e52da556823e0e08785d8571f4f9c037f4537
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=h+naam+ke+wallpaper PDF link annotation
    • http://golden-bridge.pro/how_to_do_a_30_day_no_sugar_challenge6d8k4.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/metabolism_of_carbohydrates_lipids_amino_acids_nucleotides_and_vitamins.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/liftmaster_model_877max_troubleshooting.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/gcihiye/telugu_movies_2018_website_list.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/icXffgc/10385238942.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/98054882926.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/canara_bank_atm_card_application_form_download.pdfIn PDF document text
    • http://sbrf.link/dominos_philly_cheese_steak_pizza_calories_thin_crustf053e.pdfIn PDF document text
    • http://nosumiva.mywebcommunity.org/zirubotowupupajafasixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luregaw.onlinewebshop.net/abridged_prospectus.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_21ce7e01399149dd9f875ff1e2c320d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/30230739762.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/alaska_biennial_report_due_date.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/75828812586.pdfIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_e18a3f147311496f9a06b58cdaa84e85.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_cef9c996f4d04a4f883108c1ad7ac085.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/dreams_fleetwood_mac_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/lagu_nineball_aku_jatuh_cinta_lagi.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_5ef92094b3624d79bad6def38c3fc3ab.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012685.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12685 16580 bytes
SHA-256: 94113bfa8fdb16c28448f319e7320e17ece2b795658f7a69e9f6d41484710c8a
font_00_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 6856 bytes
SHA-256: 49db3fcdfeb36ead9a51fb2aaff2940666305c3c51f03c79cf66c2adfe2c11dd
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 4904 bytes
SHA-256: bb807d51533ef43afdc4c22a1c55195f730ed2d8aa67eb3e79cba0f17c0cf231
font_02_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 11072 bytes
SHA-256: ebfee2245cc6f71c11889861086256f748fe3646c5dc07497091133d9660a739

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