Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8deaa3423b783cc…

MALICIOUS

PDF

72.4 KB Created: 2021-03-27 14:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e4ba2b4ff9e4d8b5a733b2fea93920a9 SHA-1: 6472ddb5bf1af02f532545a4a97ff2f16be6762a SHA-256: b8deaa3423b783cc498066e14aede598fd2214af10eeffbea2dee1b7a3870d06
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms or content distribution networks. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially untrusted sources supports this assessment. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings and URL analysis are sufficient to infer a malicious intent related to link distribution.

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.
  • 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/award?keyword=sap+bpc+pdf+download PDF link annotation
    • http://sigonalen.22web.org/physical_science_study_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tebesafe/hiXVJjd/tobawizedojudatoxuba.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/haIZFif/au_pair_in_america_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/gJHLije/bupaxupezitebifenevamapok.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/dgh1zjc/business_management_study_guide_answers.pdfIn PDF document text
    • http://jelojutu.sportsontheweb.net/antecedentes_britanicos_de_los_derechos_humanos.pdfIn PDF document text
    • http://godezigupo.mywebcommunity.org/32826582031.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/bartender_black_book.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/j6UjdQp/43156171165.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/onjaeig/treatment_guidelines_for_carotid_stenosis.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/vinubapiwojimosarapuji.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/HgePgiz/duwebiwozofebakisaka.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/how_automatic_transfer_switch_works.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_f1fd93d136ff495f8b5ec69143df309b.pdf?index=trueIn PDF document text
    • http://zaravugudag.rf.gd/athens_vs_sparta_worksheet.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_50e789a69f3240baa5980dccfc681598.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_067d0397246245bca65a2fbd1e8b4bd9.pdf?index=trueIn PDF document text
    • http://kapirexazi.onlinewebshop.net/45894014112.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_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 5212 bytes
SHA-256: 9a9c689a9aae95733b439df3cd6dc46742bcf75302ab955bf98b48a70a8a6ccb
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 11344 bytes
SHA-256: 780e27a53774d7696b03a78377785e7dc2845f86ee6fa884c361cbb11398370e

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