Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b19b8fcfd364415…

MALICIOUS

PDF

73.6 KB Created: 2021-05-17 19:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 51a480a56a858e73aa154b130d17ec9b SHA-1: 779447b98713dcef6ea959d02ba17d8efc2af37d SHA-256: 5b19b8fcfd3644152dca3b825d6fbdd9f8d1b60706161cf9aade2f0608da5562
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://baarspo.ru/strik, is presented as a search result for 'what is the best free script writing software', indicating a lure to a potentially malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=what+is+the+best+free+script+writing+software PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5ff775a6bd2cd.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/4297328.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/raxunutinuxupafifejomon.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/1aeac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_604f4146eb535.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/25626433267.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/kizunop.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/90071109490.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/9132765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/google_sheet_database.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e0dae2-e87d-44dd-b195-9a547d292a32/48706879281.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/medstudy_pediatrics_9th_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/fevedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38245df0-105b-45a6-b074-03a37dbc05d8/90652068769.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/de_que_trata_el_libro_el_ser_y_la_nada.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/46428612763.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/rawajuz.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/sonudozidatuputole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c625eb6-2e38-431c-8fc2-4c2f22796e50/how_much_is_the_salary_of_a_microbiologist_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/29477414810.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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 5492 bytes
SHA-256: bc740068e42f5142451f2d0add286f5f4b4d44c4c34538cb9980efb50cf69f91
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 10544 bytes
SHA-256: ee0f030425b17c223c3de6ef44d654fb053d852be0207bd19a6bffd245c18817

Open this report in the interactive analyzer, or submit your own file for analysis.