Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6d6023c132cdce…

MALICIOUS

PDF

75.8 KB Created: 2021-03-21 02:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b51453f10874bb768cad78193dd966a SHA-1: 4c9faf9374f3a5b9d908fe508b97def3c5f62194 SHA-256: 8f6d6023c132cdcea5e0285ec0ea3e1530fe84f5a4abe3176546f5117bd455b8
156 Risk Score

Malware Insights

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

This PDF contains a large number of external links, identified as a link farm, which is a common technique for distributing malicious content or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/aws?utm_term=present+perfect+continuous+exercises+advanced
    • http://mudelukise.iblogger.org/chiasmata_formed_by_crossing_over.pdf
    • https://cdn-cms.f-static.net/uploads/4419822/normal_6035f93c30d99.pdf
    • https://cdn-cms.f-static.net/uploads/4408878/normal_604d6dc8c5457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6ccccca3-a773-47c2-ab50-9fef093fbd19/samofijakosupofodefelup.pdf
    • https://uploads.strikinglycdn.com/files/84caa6ba-d1fb-41eb-a520-dd80246265eb/how_to_change_white-rodgers_thermostat_to_fahrenheit.pdf
    • https://uploads.strikinglycdn.com/files/e298f774-3454-45b8-bcc4-1914cd6eb7e7/bafulavafawojawabulob.pdf
    • http://novoniranalisa.epizy.com/gitalesibisilobeliwirik.pdf
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_116b9839d8f34100a5c088b7641193fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/60de1338-ca68-4e98-835c-12328d4c50e7/70249606067.pdf
    • https://uploads.strikinglycdn.com/files/39a15a74-c7f6-4976-a240-dd4e13b493d3/4340789094.pdf
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_b2652a9214b742d3b618ec0a36ae9055.pdf?index=true
    • http://govatojajij.epizy.com/extinct_endangered_animals_information.pdf
    • https://uploads.strikinglycdn.com/files/729d0b52-90d8-47b1-adf3-2a0d9b1e9278/98794845446.pdf
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_7eb400a0a3a6409d8856bec117ed055e.pdf?index=true
    • http://fusuzuveraku.epizy.com/how_much_does_a_supply_chain_manager_earn_in_sa.pdf
    • https://uploads.strikinglycdn.com/files/0c57bd3f-1688-437b-82b6-a4c2bac5d20e/48586438997.pdf
    • http://lavodusepigixu.rf.gd/59625859727.pdf
    • https://uploads.strikinglycdn.com/files/1b9bf6ec-40b4-421f-803d-35aca3d342a5/jimanamomedibovak.pdf
    • https://uploads.strikinglycdn.com/files/5215c309-9e69-4f73-ae94-ad2ab3aafc74/where_can_i_buy_lg_washing_machine_parts.pdf
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_bd844cf301f04ebeb964488a81792f9a.pdf?index=true
    • 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_off0000ea69.bin
687a006ddae804f2931d4bfc82805032e2d1af03c1a89645c51de4bba217ad99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 5244 bytes
font_01_sfnt_off0000fc59.bin
ec159f1d169eb612415ede586833984062e96dd1df11d476cee7fc6cffcedf96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 10344 bytes

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