Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b307855197d4725…

MALICIOUS

PDF

80.6 KB Created: 2021-03-15 18:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ce4a6395d946ecc6ee7b2823d26962d SHA-1: c759888b03e908b733d457612dc0b119fa5857b4 SHA-256: 7b307855197d4725e3894fd2983186108601d4597ed8670c5c971eb87c671b80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=quit+9+to+5+academy+blackhat PDF link annotation
    • https://cdn.sqhk.co/sazobenapur/ifieghD/digital_alarm_clock_apk.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/toyota_camry_se_for_sale_near_me_used.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/hc6djip/zadixezatatatewavi.pdfIn PDF document text
    • http://muwiduvepobuz.mygamesonline.org/14075296530.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/bangladesh_bank_job_circular_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/iffibjd/2018_can_am_defender_hd10_price.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/60759729717.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/quando_vai_ser_domingo_de_ramos_em_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/ifE9Sgc/arbatel_concerning_the_magic_of_ancients.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/74b3db21-06ba-400a-b809-80a9cbf2628b/sinejazulejizaj.pdfIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_e6630b5349c142df99c34b91647f2f15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/pised.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/sivowevumibuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619523d0-0d31-4da3-a5c4-48b3f5da7480/does_brandy_melville_have_returns.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/sagalulo.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_1f57decabe994300bbdd69d6ffe1ed6d.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_a601272aeafb45d196b633b2abd0cf40.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_727adcb3e0bf4f8f9d41e8c74003ec57.pdf?index=trueIn PDF document text
    • http://votixeju.onlinewebshop.net/convert_to_ppt_small.pdfIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_b91ff5edc68b4c1fa68ce2ed77348b11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd1a1fc-4b5c-4764-8570-77e0241b8bf8/libro_tibetano_muertos_bardo_thodol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9844725b-c745-43d0-8747-77d5899a090b/in_the_cemetery_where_al_jolson_is_buried_by_amy_hempel_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 5552 bytes
SHA-256: 44f04a9c341d62418c2821ed309a9b4c29f7c7c21a6113b3eeffcd84d4839fd6
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 11336 bytes
SHA-256: dd10ee603640f5897ac91a93e12c6b3648dac7437d902b21f4509e1a153f1a14