Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fd84865daacd25…

MALICIOUS

PDF

71.6 KB Created: 2021-06-05 20:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 502f3a92354517780379083bfa4668c7 SHA-1: 30403fb960cf47b7d8919781b79b5ca1c8cfc852 SHA-256: d1fd84865daacd2520828d531e1180f14a52e08dbb9ae3dbab83b6dbc54415a3
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to various external URLs, including one that appears to be a phishing lure for software downloads. The PDF contains numerous embedded links, many pointing to disposable hosting services, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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://crewmak.ru/pbw?utm_term=carrom+pool+mod+apk+download+latest+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450426/normal_6046afc2e62ec.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/415636.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/jowunasu-kizovo-porijuriwapoga.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/34255.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/5734386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_604dc12d85a09.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/jobigifijataker.pdfIn PDF document text
    • https://jinafoxel.weebly.com/uploads/1/3/4/5/134597088/fexokepezerevud.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416154/normal_60b4995a90cb8.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/08c98f84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_601770cc9943d.pdfIn PDF document text
    • https://fovinerorowabas.weebly.com/uploads/1/3/2/6/132682717/3860757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3a62a2-fabf-4efa-8418-d0690b1df448/the_leftovers_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1897095-f9b3-4273-bf76-6f0d5234d00e/48320817927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5492021e-c04b-4404-9990-36d29091a0ae/46984976124.pdfIn PDF document text
    • http://munonoraze.pbworks.com/w/file/fetch/144455841/materi_kuliah_akuntansi_keuangan_menengah_1_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24afd7b-bbcf-4cfb-ae28-5ef95f76e47a/37269191292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35e42c4-5eed-4782-b7a9-3349d324ac25/65916451574.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/mobile_app_development_interview_questions_and_answers.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_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 5224 bytes
SHA-256: ff1a752db80c30d51bf1059d1504010506af6cdcc95394ad5c1d6852d49fab09
font_01_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 10100 bytes
SHA-256: 96dc6ae41da16f79d9d961819073791030b2b453fa049e8ef54d7eb9ede84605

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