Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c7a8e228a323c9…

MALICIOUS

PDF

84.8 KB Created: 2021-05-05 12:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3bef148dde8b2149574adb88a2ee0149 SHA-1: eae5bb8d18a59389a32e1f423b24790e4b395688 SHA-256: f9c7a8e228a323c9c5cadc83c3235d6c1389ea81ffee358f72e4b7dcd4474596
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing lure related to 'American Red Cross online first aid renewal' to entice users to click malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://soxebez.ru/strik?utm_term=american+red+cross+online+first+aid+renewal PDF link annotation
    • https://cdn.sqhk.co/lafuwexale/iaDasij/rivilogikumimibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fdfa02fb56ac.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/fphi8qo/6989311194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_60146eb7d70fe.pdfIn PDF document text
    • https://paterixif.weebly.com/uploads/1/3/1/4/131454766/badc174b27c601.pdfIn PDF document text
    • https://rurirenaw.weebly.com/uploads/1/3/4/6/134652156/9472565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_605526659a572.pdfIn PDF document text
    • https://cdn.sqhk.co/zonigita/ZYjhz1N/alien_swarm_reactive_drop_steam_charts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fd82ab592b66.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/8511064.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/iiJigzP/sipazo.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/136fb0ad-c86f-4431-ba0e-992cf5dcbafe/xasijuwudalo.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/duxaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5edd76-3fe8-4e47-9dd3-ccea4580a070/zaserajazozoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74c92e8-bf32-43fd-a97a-8b7d9b65d8f3/79087304675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8063468f-526a-4056-aa31-0bf3899ee2a6/77132986317.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/27219908482.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/geometry_worksheet_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/20520051123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9d66b5-cfe4-4940-a94e-453223774435/how_to_buy_bitcoin_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d29250-2424-4ed8-a84b-ef5a984946c2/the_book_of_three_lloyd_alexander.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/lapirokukojar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9136e51d-29b8-48a1-9465-077cae551625/english_grammar_class_3_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c990e888-b80c-41ee-8767-35b15737149e/kebopot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2feaa906-b671-47de-8d49-8745a4753aa0/1476481722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9626f9f-cc1a-4878-8e7f-23d1d6cdfcfa/62512932758.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_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 5248 bytes
SHA-256: 7a6d9bce62e819a5956ed36af21c127fa501efc847b25d396e80cc8600dab31b
font_01_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 11468 bytes
SHA-256: c9bd8c81c7433500ac5e0c85249328d5d5a049c5e35b3f7f3e7ae0932eb6a4cd

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