Malicious PDF — malware analysis report

Static analysis result for SHA-256 407bb18ed3373ec9…

MALICIOUS

PDF

80.4 KB Created: 2021-05-06 03:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e038aeb565527a7fbc8c853d65e9ca0c SHA-1: 13b0a6ec2bf2d470d11f50d9520c187c17f100d4 SHA-256: 407bb18ed3373ec97bd70b1d0d96e8f90f3f0463341394f7f3b671fcdcedd985
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9991

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://maypoin.ru/strik?utm_term=bryant+plus+80+parts+list PDF link annotation
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/4773503.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/zakovavav.pdfIn PDF document text
    • http://nupufuzomofima.22web.org/balls_to_the_wall_guitar_tab.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/gezupivi-tebolaridovesep-wujubaxef.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/free_download_dictionary_english_to_urdu.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/bevilorano-lesoribotu-dadife-fixobixi.pdfIn PDF document text
    • https://terodovob.weebly.com/uploads/1/3/0/7/130776228/8817494.pdfIn PDF document text
    • http://kuliwajijet.22web.org/8478560791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://luzawuwu.epizy.com/hall_ticket_audio_songs.pdfIn PDF document text
    • http://pebimomedunuzux.epizy.com/fuwemiwavamokulovosevomef.pdfIn PDF document text
    • http://vewamade.rf.gd/79971588908.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/oral_b_replacement_heads_walmart.pdfIn PDF document text
    • http://wuduzinemaz.rf.gd/11th_new_syllabus_english_guide.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_7be3cb9da9014c75a5c7ae9b45326f7b.pdf?index=trueIn PDF document text
    • http://susesibukof.epizy.com/matsui_jurina_privacy.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_82a1e08ea6c444aaa76a02b7aeb2cb30.pdf?index=trueIn PDF document text
    • http://kodeketabekem.epizy.com/87692154490.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_183bffe157984412a628410953b38742.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_05242ab998b94424bfaff3ebfdc466cc.pdf?index=trueIn PDF document text
    • http://dojiseb.epizy.com/27472011241.pdfIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_bc64da972d3842aa8509fe60d2898e5a.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_c94651d6a49544648948a41a91abfe0d.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_c4e30d5c83234f8ca10bba813f27890c.pdf?index=trueIn 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_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 4952 bytes
SHA-256: 142d4969bc3bf2a3f8a7afc755d7af7db0b8d87d69a036ff48b9211cccbd539c
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10968 bytes
SHA-256: 305d47296864fcaec204f94a67329687ecab8fed64ab7947edc1e9f7dca584d9
font_02_sfnt_off000123f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c