Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e875a2b4f0acb27…

MALICIOUS

PDF

72.7 KB Created: 2021-01-19 12:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3323696492c8931f4379d744fb3c09a7 SHA-1: 19ac1b87b9297f785a643789351b69ddf4bcc589 SHA-256: 4e875a2b4f0acb27f4e4f1ce05b93a1788b6f5f29629c91cde0b14330e7c51eb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs, 'https://maypoin.ru/123?utm_term=new+elar+teks+2019+2020', suggests a potential phishing or malicious content delivery vector. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojanized document.

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://maypoin.ru/123?utm_term=new+elar+teks+2019+2020 PDF link annotation
    • https://turujidimubexu.weebly.com/uploads/1/3/4/7/134766340/a58e973eda.pdfIn PDF document text
    • https://site-1254216.mozfiles.com/files/1254216/tuxugoz.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/fanawamojabumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fd9ca1171874.pdfIn PDF document text
    • https://site-1195811.mozfiles.com/files/1195811/south_african_gospel_song_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5fe856730879a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fc3805cc4116.pdfIn PDF document text
    • https://sijawakupud.weebly.com/uploads/1/3/0/7/130740213/8530244.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/dugibabafod/elvira_manuel_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/unblocked_games_72_bloxerz.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/antonin_artaud_los_tarahumaras.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/exercise_guidelines_for_congestive_heart_failure.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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 5288 bytes
SHA-256: e46fbf799b1f6d22d3ccaa313d1d5978d7d95fa5b1cae3c3a2986903268e2f8d
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10336 bytes
SHA-256: b4bf074ab8386f9c1ab3ff787a03c0448a2bf992e0c5c624322d5fad852c163c

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