Malicious PDF — malware analysis report

Static analysis result for SHA-256 72de6eb4d75e93b8…

MALICIOUS

PDF

81.7 KB Created: 2021-03-21 10:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7565f5c63ddef46476b04777adeb7173 SHA-1: c0949c2163dc2710d5d7c9047d13b684f7482479 SHA-256: 72de6eb4d75e93b83deadbbb23b9321fb4568cc0b5a9105967e68b7f39d38728
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, which is characteristic of a link farm used to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier flagging further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/123?utm_term=ofsted+report+farnborough+sixth+form+college PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fd6345dca287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_603b4e1336613.pdfIn PDF document text
    • https://bafewalu.weebly.com/uploads/1/3/5/3/135350628/dobolaku.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/30106703106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fd8cafce455a.pdfIn PDF document text
    • http://potavivas.22web.org/nifarakozexosifas.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/675a5f43f60a87.pdfIn PDF document text
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/8945570.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/99712481756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dazidotidipo.rf.gd/productivity_performance_appraisal_phrases.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_fae9aeb34cd84a6dab368a3452d61e60.pdf?index=trueIn PDF document text
    • http://kavagisere.epizy.com/wilms_tumor_pathology.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_e738c088466341e298a65254f4856f8b.pdf?index=trueIn PDF document text
    • http://movisupe.epizy.com/arduino_pro_mini_projects.pdfIn PDF document text
    • http://belevenefinul.epizy.com/dsc_1832_master_code_reset.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_92b088108bd044d2a2c87bda2568a111.pdf?index=trueIn PDF document text
    • http://rapaxaj.rf.gd/24184047963.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_c7fdf5e72760400f9ec72547239131df.pdf?index=trueIn PDF document text
    • http://nibewisule.epizy.com/36331932083.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/roomba_960_mapping.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_08208a5840bd4918aa8a7d776bde9ae0.pdf?index=trueIn PDF document text
    • http://radumepetunonif.rf.gd/david_r_klein_organic_chemistry_3rd_edition_solutions.pdfIn PDF document text
    • http://wexugemo.epizy.com/akela_hu_main_song_mohammed_irfan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5688 bytes
SHA-256: 3aee1f7c7708bce94ea1f525dc424fb04bde032618d547e666250ac60b6c2632
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11184 bytes
SHA-256: d3c8257529e6a2e8aaa2c1b7d8b90b8b080fef399e24fa9ff8c522ea3c279221
font_02_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34