Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb30b20b7a6469e…

MALICIOUS

PDF

84.3 KB Created: 2021-03-24 01:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b88964d6dea1f56f2ec884cace1518db SHA-1: 13223472288a6951b882a3ecad3c1188c2baa737 SHA-256: bcb30b20b7a6469ef2d99b5f0d7c593375c352a3d17364d7e8acfa9a4b84a4d8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/wix?keyword=simultaneous+linear+equations+word+problems+worksheet PDF link annotation
    • https://cdn.sqhk.co/nigezufi/gfhdrhc/v8_car_traffic_racer_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/hcOciaR/33013777817.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
    • https://uploads.strikinglycdn.com/files/9019b61f-ade2-4783-b230-fea0a5c738fa/kasugo.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_3cfafee3e9bc4e839517d091f96ebdf3.pdf?index=trueIn PDF document text
    • http://zegejiwob.epizy.com/john_deere_x324_snowblower_installation.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_c94d0282f26c44f49afc50083e5fca85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunojipu/what_is_the_setting_in_the_veldt.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_0645ac6c0c154eb9b7ef696bcd81274a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3117d654-3cbc-4aa6-99f9-b756bec56850/curso_de_ingles_online_gratuito_senai.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_35d8ebb981264c1493acce04f88e05ff.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_d187d52850fd4cdbbdfaa63c77736387.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/823c8f4b-cd81-45c5-827c-538e12544fa5/jisubokajaxelewakagagejuf.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_9834e63e05ed42e69cd8793c52b33d1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/pdf_avivamento_pais_de_gales.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_61872c2190104b60bfa9a7103b7314a7.pdf?index=trueIn PDF document text
    • http://sufizewuwavibu.epizy.com/guronog.pdfIn PDF document text
    • http://vubixegigag.rf.gd/denuxugemagonenuvazoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83687141-ad34-4c8b-a5fa-f466f2963e87/kerevelisixadexunaputine.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_d1e8c8ab2c30458d98d43d63e422bac1.pdf?index=trueIn PDF document text
    • http://ketekuvewekuga.rf.gd/junudobilelaziwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8e77fc-c582-4a5a-9e74-09fba45bdb1b/81290229356.pdfIn PDF document text
    • https://a5ae2c7d-b945-4904-baef-6b14a2cf1b96.filesusr.com/ugd/2d1648_49a74926e70c4a3e8b403ecd98e1adf1.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_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 5604 bytes
SHA-256: deff76342186e1812059837cb378b5502da9f13811a50f2ffa8f7f5c49c5beec
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 11940 bytes
SHA-256: f2bf0cbff207167490104bac7b39f6ddb7f5c9f962b8c4beb786ee33bcb211d9
font_02_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e