Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cdade5763c243a…

MALICIOUS

PDF

78.5 KB Created: 2021-03-10 07:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 40953d1451c8ed8f908f83b5b9df9888 SHA-1: ddde3ed6b44094d7176ab573cd0ee1fd8246ce41 SHA-256: b8cdade5763c243a33887dc0cc7fe3f51946166d396fc703d707ea3cf932de5f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, embedding numerous URLs, with at least one redirecting to known malicious infrastructure. The document's content, disguised as 'Ishihara color blind test answers', is a lure to encourage users to click on these links, likely leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=ishihara+color+blind+test+answers In PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/f6ee356a8.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/75505687513.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/83447815837.pdfIn PDF document text
    • http://lnstagramoriginal.com/lusatolumalojagazazukinu2i18u.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/is_cyberpunk_2077_multiplayer_coming_out.pdfIn PDF document text
    • https://goruwikok.weebly.com/uploads/1/3/4/7/134740681/7949254.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/nuxosepitanunez.pdfIn PDF document text
    • http://storeyou.store/72651413837hylzy.pdfIn PDF document text
    • http://slmit.space/city_racing_3d_pcam838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_d42cd91100e14169a2601656ae9f8747.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_b80eaf12adcc4134996e0ea1305be08c.pdf?index=trueIn PDF document text
    • http://futakanawus.onlinewebshop.net/73667602422.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_73d11e296e9e43f0a6c1ad58a437a14a.pdf?index=trueIn PDF document text
    • http://vuzadelulamow.rf.gd/injustice_gods_among_us_pc_direct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b237bdb4-fad8-42a9-998d-4f324807ee46/20372680028.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/seven_years_old_song_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e443764b-1a48-4e70-98b9-1684ab6461e0/nazm_hikmetin_iir_yazd_kadn_bulmaca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c8be73-2370-47c4-9247-b406c7405b32/70415080746.pdfIn PDF document text
    • http://meduzifovum.epizy.com/what_guns_have_black_ice_r6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d2526e-65b8-462f-ae54-4f790ed1fe59/37748657112.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_ffcdb29157aa4bcebce51fa0496e9c32.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_fa18cc4d9c3048b49bc1cfacff54a00e.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 5196 bytes
SHA-256: 21cf48bb6e4f03df6ab470f1f040155f0939ba8f496c4bb43379f5e40c55bd01
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 11316 bytes
SHA-256: 2cee389529c583315a83813d341d677153a66ff79b9b9f37fab1fdad1ef869a7

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