Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba5218d63823d3c…

MALICIOUS

PDF

75.7 KB Created: 2021-03-22 10:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cd8c8648bfdf38d5c6dbf77c8ecea7eb SHA-1: e6915cb8b8ad12e6b4a1dbb607f4d1876930046f SHA-256: 8ba5218d63823d3cefd529da1667986395ba120751d7eb225e8ac03e4ad382bb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious content, masquerading as legitimate documents.

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://gimoguvi.ru/123?utm_term=6th+pay+commission+karnataka+kannada+pdf PDF link annotation
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/kovovijeri.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/roluwafa-sasumojibin-rikujag-babepaxunovala.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/vetisawenevobovuket.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/37756086818.pdfIn PDF document text
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/d8c270f5.pdfIn PDF document text
    • https://bivawufixusu.weebly.com/uploads/1/3/1/4/131453301/7771661.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/dajusixune.pdfIn PDF document text
    • http://wenatal.getenjoyment.net/anatomie_des_organes_gnitaux_de_la_femme.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/8956199.pdfIn PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/vifakekebezisexuz.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://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_282f509a33364754822c062734777bf7.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_2a7c160c51f048db81d7e5766ec9464b.pdf?index=trueIn PDF document text
    • http://kiwivesunita.epizy.com/mivomeguxijenorinowo.pdfIn PDF document text
    • https://311919ef-92bb-434b-a93e-382c1a5e2e65.filesusr.com/ugd/c893b4_3ebf80282dc84be298ee48bbe226a779.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/52040523920.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_0858b8a0626b4ed4bab3c29951a47e0a.pdf?index=trueIn PDF document text
    • http://jonesojawu.myartsonline.com/a_song_of_ice_and_fire_hardcover_box_set.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_b30052b1731c479ab06013e5cdd9d29a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/halloween_2016_fgo_guide.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/oecd_guidelines_for_acute_toxicity_studies_425.pdfIn PDF document text
    • http://derazikabulode.epizy.com/begenokewidovitajexikid.pdfIn PDF document text
    • http://pemukusa.epizy.com/2769678146.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 5260 bytes
SHA-256: f98384be4cad502b5e7f2a999aa481633315bb8465db51af905555a4743a5a5c
font_01_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10660 bytes
SHA-256: 8f2a617b5bc1d2d0d0c69dd6afd981eb5141dcbd99b51beec0c08841cc053a38
font_02_sfnt_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2