Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2e85907d195718…

MALICIOUS

PDF

82.2 KB Created: 2021-03-04 02:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0b0f5d4b3aea6e5aa0588b195ff99f69 SHA-1: ad3e067f16f7146491687b2d74bff0f0199a4fa1 SHA-256: 5e2e85907d1957186e631b907e3857a0cd9cd8202be432f0122af7aa7838fd0b
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 designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via external redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=d+and+d+meats+jackson+ca PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fd090d59006c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6025abf08c683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_6010354d6f569.pdfIn PDF document text
    • https://cdn.sqhk.co/midubevine/gggfMWi/todo_list_application_self_hosted.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/9608086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fcacb6c8514c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_601dd628269ac.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/EKpghjj/define_politics_political_science.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5fd8f987b5b9d.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/jgljfvt/50032651453.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/food_coloring_worksheets_kindergarten.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/tijupodewebojudupoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_600e9e3d01e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389570/normal_5febb08b648b1.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/dyjVicj/10278417593.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/kibavutibeved/wavisotawofidobivokoru.pdfIn PDF document text
    • http://xarozitapakegur.epizy.com/92577951736.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/36306634546.pdfIn PDF document text
    • http://tepaduvofevog.rf.gd/dihybrid_cross_practice_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/cuneiform_alphabet_easy.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 5096 bytes
SHA-256: b66192a66ac88a80a7df18095eb6ac02e680ffeaab7ce468ec14a363dd52401c
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 11268 bytes
SHA-256: a1460eb4511406a1111d33413a4f855f1ff5855e6dd6948dc899bda7e6010dc0
font_02_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf