Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b76f09be80d288…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 20:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e334b1828b56d2d3c9f4637d0799a03 SHA-1: 71ac9f61a543b3c09ff4997ab3c0a4fe244ee8d4 SHA-256: a8b76f09be80d288fc363d31377348792075136e559b93c5ab55962e5434815f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=a+new+handbook+of+literary+terms
    • https://cdn.sqhk.co/pofaxiniraz/ZAaCdsP/bemozapaxegopiz.pdf
    • http://dakajak.medianewsonline.com/metodos_anticonceptivos_minsa.pdf
    • http://nonowun.mywebcommunity.org/aws_certification_exam_readiness_workshop.pdf
    • http://valigulepi.scienceontheweb.net/oxford_word_skills_idioms_and_phrasal_verbs.pdf
    • https://cdn.sqhk.co/zozevuxe/ggVhhih/vurekotavezivinexigun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_683b06ed57a5490fb9cb50924718fb1f.pdf?index=true
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_2aa83562ba0c4ad5aab04d9f21ca7213.pdf?index=true
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_7b46055536fc4ba3af896e1454bd7b14.pdf?index=true
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_cea8f2efaa0c47dbbf89df5ebb94aacb.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_759290f6ad9a4d71a96356de041bc284.pdf?index=true
    • https://s3.amazonaws.com/tezude/27417766320.pdf
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_55f67d946ed841188e2a6bee38c5c466.pdf?index=true
    • https://uploads.strikinglycdn.com/files/95bcf69d-f951-4861-874d-504e5c72bd25/britax_car_seat_base.pdf
    • https://s3.amazonaws.com/sazariwapa/49735867118.pdf
    • https://s3.amazonaws.com/zakunafu/samsung_sdr-b85300n_default_password.pdf
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_13fb6801de72436ca6c61e95842be17f.pdf?index=true
    • https://s3.amazonaws.com/rixevozajixezos/cotton_bed_sheet_fabric_crossword_clue.pdf
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_c21107ece7714413a093626fd42c5695.pdf?index=true
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_7c7f8aae603a42458c3cb7082cb9fea8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c2028a47-8522-4137-a6d8-9e69490520e2/1665415608.pdf
    • https://uploads.strikinglycdn.com/files/ddbcf267-47bb-4966-ab90-15e02acfc0ba/davis_drug_guide_free.pdf
    • https://uploads.strikinglycdn.com/files/060f61af-7550-4b12-9ba3-d4bdf8ebe6e8/how_to_install_nuance.pdf
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_a62291106a36484babbdc123b1f95186.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_off0000f012.bin
59742168c44a071e6ba089548a59af873b36f539a20d50263c720370548910db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 5536 bytes
font_01_sfnt_off000102ca.bin
09a1231ceb4fed4dd071c6df99178d423169e80447d9a3d5837ab3d49a1537d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 11456 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.