Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7db0dddd8eb6658…

MALICIOUS

PDF

74.2 KB Created: 2021-03-31 22:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c535ea3bebff49a34973c41bd99f83 SHA-1: 507be20e39d8adcd52aa0d163736d5e6423bc270 SHA-256: c7db0dddd8eb665813c12822e257424ae23e9f2abc39886e2a006d3c58f17011
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/award?keyword=bearing+dimensions+chart+pdf
    • https://cdn.sqhk.co/wiwokosokif/c4hcgi5/beli_pulsa_listrik_lewat_mobile_banking_bca.pdf
    • https://cdn.sqhk.co/mosepoxik/jbhgnEA/mezota.pdf
    • http://saripituxupagek.sportsontheweb.net/ignou_mcom_assignment_2020_19_solved.pdf
    • https://cdn.sqhk.co/vefobinibe/ieibicJ/molajoxuketi.pdf
    • http://xofofumireke.mypressonline.com/ikea_king_size_bed_frame_with_storage.pdf
    • https://cdn.sqhk.co/xudadidi/jsgi0if/88131933513.pdf
    • https://cdn.sqhk.co/fikalibumi/chegcnP/gepowujetibiwuxibivovon.pdf
    • https://cdn.sqhk.co/vofepubot/qib09ib/camra_good_beer_guide_app_ios.pdf
    • https://cdn.sqhk.co/zubuwebofe/YCIN9F5/at_t_thanks_app.pdf
    • http://zobabikox.medianewsonline.com/bimon.pdf
    • https://cdn.sqhk.co/sewizefaxiki/jhbEXiI/ice_hockey_tickets_near_me.pdf
    • https://cdn.sqhk.co/vafegijateno/dhegcij/nick_jonas_movies_and_shows.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rozebofukixus/sekab.pdf
    • http://kisalonokexiwi.atwebpages.com/dadivimuzi.pdf
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_d3d112367604462496362cdc2d0534db.pdf?index=true
    • https://s3.amazonaws.com/mubemutolewe/bharatanatyam_songs_telugu.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_0d192652408841cb8309d4435fd2bcec.pdf?index=true
    • http://kalasoziluxolim.myartsonline.com/australia_visa_form_1415.pdf
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_b4d84fe6d9b34fc793c6136642c7cbca.pdf?index=true
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_841bc8361ecb4aff8d635770b7de6ecc.pdf?index=true
    • https://s3.amazonaws.com/wamatasamegu/return_address_format_singapore.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_e22e8171185e453085d459a4479ddaeb.pdf?index=true
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_d97a4b1d9e5b4394ae69384269113ca1.pdf?index=true
    • https://s3.amazonaws.com/satedafadusizo/dulegajuzejenalaxujuju.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_off0000e283.bin
8febbf625994494d0e18722c8e4f32fea1c6fbeb58a6f0505ba91b18cc47935e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 5588 bytes
font_01_sfnt_off0000f55f.bin
966cfe4f83dae3aad10a42f9f17035668032e19f7fbed7faf09f13064426d8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 11224 bytes

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