Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ea99e68c598328…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 03:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 24f1675fa3e7ad74585d7f4b214a7b24 SHA-1: 9380e214d50af11fe89135e827a06dae294ecdfa SHA-256: 21ea99e68c5983286316278d1ecf026ff9eaf521baed5a7e91546a4ccacecf7d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as https://midufefew.ru/123?utm_term=chunar+full+song+video, are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=chunar+full+song+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450635/normal_5fe8bd6c9a309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_60212c8f55242.pdfIn PDF document text
    • https://sozamevojor.weebly.com/uploads/1/3/5/3/135309273/torekawesev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5feaf26f6592b.pdfIn PDF document text
    • https://cdn.sqhk.co/bibobovezave/KEujcia/bad_day_for_the_cut_full_cast.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/cfacdb8.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/zulilefe.pdfIn PDF document text
    • https://cdn.sqhk.co/sesakiwewe/wjg3iir/54148919396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_603b208911b5f.pdfIn PDF document text
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/3c34d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fdb177b05e9f.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/hfii4gf/extreme_car_driving_simulator_2_download_apkpure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapizof.rf.gd/google_play_store_apk_latest_2019.pdfIn PDF document text
    • http://xesesusotuniw.rf.gd/ludezadovetetuxiwizaf.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_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 5136 bytes
SHA-256: 791096d81eed942df9d45a9cf1c4a39394f78947c9b0a22d87b6f5d34d596275
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 10740 bytes
SHA-256: 7e57bef5393091845eeac6e7ace97c7868252cd137c13b28a7b9762346d469af

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