Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f0ecb8599d0d1e…

MALICIOUS

PDF

83.5 KB Created: 2021-05-19 22:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: edf6f0e1d0ba4be0f26ceddcf16f34a8 SHA-1: 71245b16f2c5ab0530b4b44ec85914c19acba965 SHA-256: 90f0ecb8599d0d1ef57b32aa5be3f9f8f69e475d3f695c459605488829ee0cfc
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 phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=que+significado+tiene+el+camino+a+emaus PDF link annotation
    • https://vejewumuwuwaja.weebly.com/uploads/1/3/4/7/134759129/tuzojuwuwuzarixu.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/kefidup_rivokixifi_fowesuzotuwipi.pdfIn PDF document text
    • https://siwikuzovusodig.weebly.com/uploads/1/3/4/3/134357046/584583.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/sisap.pdfIn PDF document text
    • https://poxuroli.weebly.com/uploads/1/3/0/7/130738943/joxefu.pdfIn PDF document text
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/7091736.pdfIn PDF document text
    • https://netemadore.weebly.com/uploads/1/3/5/3/135306203/9985396.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/dubiditiginowo/72261859057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825d6777-5ba7-4b0d-be12-8d97579f1c69/82553428127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0313fc-e44b-4eb3-be05-dff7f2b40aaa/2020_lexus_gx_460_off_road_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df82d2f6-7f4d-401c-b1ef-7754a157d06a/the_beautiful_things_that_heaven_bears_by_dinaw_mengestu_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb138b19-c544-40f0-b69f-4112b8c70049/62079524951.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/wugijekivepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84bfdae9-3433-40a9-8c8b-94260f0bbc43/xaromasori.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/anaconda_movie_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8047d086-f232-4e49-b5a1-952292d5087a/how_can_i_increase_bowel_motility.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/solving_quadratic_equations_mixture_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320d5067-39eb-4750-97be-8422feb0f04f/sig_p238_380_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f64ee79-71cc-4a4f-816a-04ea3a115cdd/driver_stampante_samsung_scx_4623f_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/21554893415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515b11f1-548a-496d-ac42-95b33d781ad2/how_many_carbs_in_keto_diet_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ab7b87-ac50-4985-bc9a-a3844a5dc00b/how_to_put_together_total_gym_1100.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_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 5308 bytes
SHA-256: b09353ebf81951ddb2ecfdf89e2675d8c07a6d91d4792d9f2799a00f85d6af27
font_01_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 12156 bytes
SHA-256: 2aaa76b063cb557375e89023b4775e202a17ee39c664ad94276ec8f673d94328