Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a946e35a6056a4…

MALICIOUS

PDF

79.9 KB Created: 2021-03-09 18:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 788ceb1d50602cdf7cb94eec9fad9208 SHA-1: d5a7baa4d6372ec98437ae6df2a0bab6ab3653d5 SHA-256: 23a946e35a6056a4b41cb25fe9780a5f74ad389c7f7c27967edb4349ca4df445
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 0.9993

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.
  • 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/wix?keyword=the+cranes+short+story+ending PDF link annotation
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/8e81c236.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/9997296.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/2948626318vt4i8.pdfIn PDF document text
    • http://qwonder.space/angular_formgroupname_directive2mgem.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/Qjfhjjc/62300653044.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/fb81c6b.pdfIn PDF document text
    • http://porn77.design/define_archetypal_criticismv8gvm.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/what_fermented_foods_are_low_fodmap.pdfIn PDF document text
    • https://pakupefo.weebly.com/uploads/1/3/0/7/130776676/rakel.pdfIn PDF document text
    • http://devlp.club/patricia_highsmith_short_stories2zhw2.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/6zjb0ii/39555647825.pdfIn PDF document text
    • https://jukawowirorab.weebly.com/uploads/1/3/4/6/134662443/a5153e0.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/mhigAje/nebum.pdfIn PDF document text
    • https://fubewewafipox.weebly.com/uploads/1/3/0/8/130874235/bc1f6a556e.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/fiwozusexalodo.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/6300217431.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/m0ehbhb/delebejomuwanikufefovulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zorijefugixor.atwebpages.com/descargar_la_biblia_reina_valera_1960_gratis_para_celulares.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/komebutonobumo.pdfIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_11ec380d96094d81b19e8e6d2ad78672.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_cba13c367d9f4a46905e6efcc6051e84.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_b34ba3cff2c145a28ba2bf8f76103282.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_00a0930aa0b24a119753be000db859ec.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_15b6313b25f54d9a85c6ed8ba5ee0bd7.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_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 5220 bytes
SHA-256: 854916d4b141a35e50f211b832aecfe1888a9d18e7dfef2c1883e57c7d9757ee
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 10360 bytes
SHA-256: ddf4a69e192b1e45f07d270f32ac29790cf9e98e95f035e78d15e2de156852e1

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