Malicious PDF — malware analysis report

Static analysis result for SHA-256 205304bbc57286c5…

MALICIOUS

PDF

78.6 KB Created: 2021-04-01 15:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7805c8e4c4d71ee389ee54e99d930e42 SHA-1: 71b93e5a0c0ef81e5ffb7e47b690ffadc9aca6b4 SHA-256: 205304bbc57286c55c64f9a5e13188030b6150bc36dd3e9f71d16c413cf07bad
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to job request forms, aiming to trick users into clicking the malicious link.

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
  • 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 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://yafferge.ru/123?utm_term=job+request+form+template+excel In PDF document text
    • https://cdn.sqhk.co/korebuxaguz/njejjJQ/fall_guys_guide_free_download_mobile.pdfIn PDF document text
    • http://afracheat7.xyz/whats_newsmax_tvx0j19.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/dgjjjhb/94808913840.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/92992104248.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/what_are_the_elements_of_psychoanalytic_theory.pdfIn PDF document text
    • http://appletopshop.ru/79098725758thny7.pdfIn PDF document text
    • https://dosevabif.weebly.com/uploads/1/3/1/6/131637409/3aaf598.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/81087516983.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/gdiiKjh/embedded_linux_interview_questions_and_answers.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/pegasus_shower_faucet_repair.pdfIn PDF document text
    • https://finikepimu.weebly.com/uploads/1/3/4/0/134017618/6de3ec1.pdfIn PDF document text
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/muvufijokumejipanub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_6598ffc69ca3468e8548f78ab4e08a52.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_14385f2f6f67488ebb89b31625b9f263.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11d124c-d684-4232-aabe-49a9686d7b26/como_convertir_milimetros_a_pulgadas_fraccionarias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9df8263-288b-4db1-a013-15fd37a8798e/daletu.pdfIn PDF document text
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_9ab3f084a0b44a16bb8868f4df735e52.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_5ffa26f84b164a9eb246ef0a9546ab63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/453534cf-b2ae-44eb-a79d-ba803e5b04be/how_to_start_a_private_investigator_business_in_massachusetts.pdfIn PDF document text
    • http://wawikoduvebakap.onlinewebshop.net/47716580942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdd5b25-4e05-4149-aa46-44ef0ff47ded/dopiguvol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff80e8df-75ee-4d7e-8a05-feaacd239bb4/2550619925.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 5484 bytes
SHA-256: 713337b5582ebdaad196259488175894684eb55c67465c1bf569705f048855f7
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 10088 bytes
SHA-256: c69eaa8c02b07224cdbd72601457eaa0cf0fb5d3e32244242984cf3908ba9d8c