Malicious PDF — malware analysis report

Static analysis result for SHA-256 d400361868c906dd…

MALICIOUS

PDF

76.5 KB Created: 2021-05-16 14:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 32000db6470e4bd8de7e0463b0e58a8b SHA-1: c04465be3515acab3f50ccca83703609acb7f22e SHA-256: d400361868c906dd31c848cca59429fd424b8a2c3679a352d6f83f56040fa1b7
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=how+much+does+a+kirby+weigh PDF link annotation
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/51e21d7254.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/if6EiiH/shot_put_ball.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/ghXjagR/physics_balls_on_a_string.pdfIn PDF document text
    • http://ginosolatowu.iblogger.org/how_to_pass_navy_advancement_exam.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/8935335.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/airfix_model_world_june_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/f8jjuCV/rolling_droids_gif.pdfIn PDF document text
    • http://zakemelevij.iblogger.org/berger_paints_annual_report_2018-_19.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/geletujule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewugozosefo.epizy.com/unstable_angina_pathophysiology.pdfIn PDF document text
    • http://gujodelabugujaf.rf.gd/accounting_and_finance_for_managers_book_bharathiar_university.pdfIn PDF document text
    • http://redexini.epizy.com/54445427056.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_64bbe6d4180d4958abbd86cb42acd162.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_0e0392cb7bcc483e8e98029506812417.pdf?index=trueIn PDF document text
    • https://e1dd9d5d-2564-403b-b9eb-750b563e155e.filesusr.com/ugd/00b056_d32932ca69934b2d9c7b1c51206b218e.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_1f8416c77b614b65ba5feae02c098d89.pdf?index=trueIn PDF document text
    • http://jadaxanesutav.epizy.com/disokekaloworosamutabu.pdfIn PDF document text
    • http://tavuxikib.epizy.com/26331588644.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_a0fdfc07918341258bba7b686bf9a965.pdf?index=trueIn PDF document text
    • http://velosipu.epizy.com/udacity_social_media_advertising_guide.pdfIn PDF document text
    • http://kufelinal.rf.gd/dds_cad_crack.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 5680 bytes
SHA-256: f0373764b5232272dbdf047d73572acafe42c01f9f2f4a0d967d8554182825ab
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10632 bytes
SHA-256: 444c1380b7fdfbacfa28af105a0618d61dd4a4343a8993fe16d2056b7bbccf41

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