Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9931ddea6a5ae6…

MALICIOUS

PDF

83.1 KB Created: 2021-03-28 00:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 78c498b5be62032fc4c014e1213f320e SHA-1: 55788f34aad901ca7967dd7092fd2ee6f2fa8ed3 SHA-256: 4b9931ddea6a5ae6ca574fad1eec5e587e5dc2a84acab48a39b799386228c461
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=animal+farm+book+chapter+10+summary PDF link annotation
    • http://sufulilutidake.mypressonline.com/47412363732.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/quote_from_the_little_prince_about_stars.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/rearrange_pages_online_sejda.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/3c63c1ccc9.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/4773749.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/fimiforuxuz.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/bestiario_de_aberdeen.pdfIn PDF document text
    • http://rubka.space/59317229524nue9h.pdfIn PDF document text
    • https://xafovudomogagak.weebly.com/uploads/1/3/5/3/135324285/vonevuk-misilokova-wodajixotuno-ketuwa.pdfIn PDF document text
    • http://uose.xyz/percent_composition_practice_worksheet_with_answers2tozh.pdfIn PDF document text
    • http://mosquito.codes/adms-2i_ft-8800_programming_softwaregk9w2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcc3762-e9aa-47a5-bcc9-324dd0698a75/sipavigexejewarawe.pdfIn PDF document text
    • http://gefuwaw.atwebpages.com/psychometric_abstract_reasoning_or_logic_test.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/2002_ford_explorer_xlt_transmission_dipstick_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cbe9c1-ecf1-4eec-801b-6d27409bf4d3/how_to_program_genie_intellicode_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b73442-f913-4e63-a549-3d4d39e096dc/tomtom_one_n14644_preis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ac3b69-4c55-49d5-8010-bcbee26c12f7/should_covid_be_capitalized_mla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f761092-7e75-476d-a7d3-09c1f67b692a/55903729507.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_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 5744 bytes
SHA-256: c59579685b8f75f40f0948d1ccf619fd93241f3069d6a2914e40964ad90eae59
font_01_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 10828 bytes
SHA-256: aa7f346e2bd614f1d32147a8a9426757eee7b5b41ea487d28a67569128ebaa7f

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