Malicious PDF — malware analysis report

Static analysis result for SHA-256 811b80245189ec44…

MALICIOUS

PDF

83.6 KB Created: 2021-03-18 06:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 450ecddf40fa2a48fafc07888b461b30 SHA-1: 59eb9e9bc2f788560c005640084da8ea770ffcd0 SHA-256: 811b80245189ec449235145d984e3e2bf26c1967fe2b52359384351dbf92426c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/strik?utm_term=how+to+start+wordpress.org+website PDF link annotation
    • https://cdn.sqhk.co/puxedimuwo/geihibe/55927692197.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/a7fnohh/xexakug.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/cifZ8MW/bitmap_vs_image_android.pdfIn PDF document text
    • http://zomosidotewe.sportsontheweb.net/10285920781.pdfIn PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/rofulebawup.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/ngdhbvu/thorogood_flyway_boots_review.pdfIn PDF document text
    • http://businessoutsourcing.org/67215366310ot2xu.pdfIn PDF document text
    • https://kevigedevuk.weebly.com/uploads/1/3/1/4/131438682/410abc7051bd1.pdfIn PDF document text
    • https://lagizipat.weebly.com/uploads/1/3/2/6/132681030/dofov.pdfIn PDF document text
    • http://goloszauniver.fun/30429880107a30lz.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/55224855967.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/hcdibQk/goddess_kiss_dmm_wiki.pdfIn PDF document text
    • http://nubolutlion.xyz/who_dies_in_avengers_endgame_comicpo8t8.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/6873511866.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/dtqcFja/gekijiveju.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/nThehb0/what_causes_endless_runny_nose_and_watery_eyes.pdfIn PDF document text
    • http://procripton.com/drug_information_handbook_for_dentistry_25th_editionowz1n.pdfIn PDF document text
    • http://discount50it.pro/oxford_picture_dictionary_third_edition_free_downloadya32w.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/VkjaiaD/block_strike_download_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowojuxibaxo.myartsonline.com/xekejakolovemetagit.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 5320 bytes
SHA-256: 8ae8456b47abb5db7b902d656b66890f758ada6c7881ffffa5d370fde9847621
font_01_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 11096 bytes
SHA-256: 7a03ab30440911b4208d093e51c7611e5d9207a7afcc494c625074dfe46adbec

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