Malicious PDF — malware analysis report

Static analysis result for SHA-256 1689dd328884dd2b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-11 05:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cf9243129a1a5f21945765256c06c006 SHA-1: 53c645546dbaf490b6a92c0ddf4c39ae3f8acc64 SHA-256: 1689dd328884dd2bc333b617a9a31181c0b2afb116a3097fab8fc27718178e2d
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 0.9996

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://fokemale.ru/123?utm_term=free+online+no++bejeweled+3+game PDF link annotation
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/f9c810.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/8OMoR8n/8467587939.pdfIn PDF document text
    • https://fejevudud.weebly.com/uploads/1/3/2/6/132695511/vinafi.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/4hbRI9m/download_map_of_toronto.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/8YA1DSW/31399410743.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/620869.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/a4dizD0/baby_shark_halloween_book.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/4jhp0hg/granny_chapter_two_new_update_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_5d09f1d5e6dd49008addb75f90966550.pdf?index=trueIn PDF document text
    • http://fosixijikalapi.epizy.com/7533726489.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_24d34bdd66714c5898700d3249d53ca0.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_8e2c692ecbe74e3e8d67e10a92ec886e.pdf?index=trueIn PDF document text
    • http://xuposusan.epizy.com/wofilanagifaturetisotesul.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/86638306008.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_b33229e0fe734a748e4a41d4fd0d078f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/xokifevifosuk.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_c99f2ced46494a129192e0c165d451de.pdf?index=trueIn PDF document text
    • http://talakukatutevib.epizy.com/nutrient_cycles_packet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/53652864741.pdfIn PDF document text
    • http://xubedoper.epizy.com/muxikaxepuvapunotimi.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_d428f34490994f719fcd69b9bd51e698.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_2d364364e30e4fac92e5166998a76e25.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 5396 bytes
SHA-256: 745856d16054d4e35415dbb29f7b3f9742ebbc1cf2010081dba6f542650dca38
font_01_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10348 bytes
SHA-256: 040f48ba00f3159d4a738106fe89eefe75ff78a10029e75f9a94753c13b8c265

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