Malicious PDF — malware analysis report

Static analysis result for SHA-256 9324149f3df0266b…

MALICIOUS

PDF

80.1 KB Created: 2021-06-04 11:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6f50e6b26b3b582ff611c1d47d9280a5 SHA-1: 0519967f226ad594048a5135e57b6517bc8e80fe SHA-256: 9324149f3df0266b092a850f867a934bd3fdfcbac948b9df77a76fd9a2a7c9b8
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and hosted on platforms like Weebly, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for distributing further malicious content or phishing attempts, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://laborke.ru/pbw?utm_term=boss+and+me+ep+30+sub+indo PDF link annotation
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/gigadusuvemajogojed.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/e3deaeec40.pdfIn PDF document text
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/4f33bbfa7.pdfIn PDF document text
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/9299769.pdfIn PDF document text
    • https://jotozorofelafik.weebly.com/uploads/1/3/1/4/131405965/xanekuzobojukub.pdfIn PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/5113899.pdfIn PDF document text
    • https://puvebimu.weebly.com/uploads/1/3/4/3/134311544/a4c50.pdfIn PDF document text
    • https://pazodozonevaken.weebly.com/uploads/1/3/4/6/134606284/zewidujafuz_digosabepiwupuw.pdfIn PDF document text
    • https://xodomifosipux.weebly.com/uploads/1/3/4/8/134865855/gevigivud_xujokerap_wafenijemi_tenufewujasovi.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/1659444.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/897bb5f3071.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/65dd5cbdcd4.pdfIn PDF document text
    • https://winapusumebut.weebly.com/uploads/1/3/4/6/134695108/6505836.pdfIn PDF document text
    • https://womepibenim.weebly.com/uploads/1/3/4/0/134040947/4765695.pdfIn PDF document text
    • https://sajawibur.weebly.com/uploads/1/3/4/6/134631073/gazeruku.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/dosomigogapata.pdfIn PDF document text
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/gilek.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://joxupakager.pbworks.com/f/electrical_wiring_industrial_14th_edition_free_download.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144424068/super_brawl_universe_apk_obb.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144436506/54745020855.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144529299/23149693048.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144574497/camscanner_ad_free_apk.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144557103/82459291248.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144434799/istanbul_tatili_filmi_full_izle.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144506910/kerafip.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/aplicaciones_de_ecuaciones_diferenciales_de_primer_orden_circuitos_electricos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 3500 bytes
SHA-256: 32bc913f535efff2a891345bd370e988a6fcb3758195bdc4f598cf2cbefb5c0d
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 5276 bytes
SHA-256: e464372e8778835a094e1504eedcedef736a023982e4e9eef0f519fe497083ff
font_02_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 10716 bytes
SHA-256: 2944f886b354ced0fc5cd58a375c40c9b02be87525e321b2966030ef64777070
font_03_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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