Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd23d5e03bb2e01…

MALICIOUS

PDF

75.3 KB Created: 2021-05-17 21:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ed441781f12259e2fb4f178ada35377 SHA-1: ac5f39522839f19b38fc434ea144100fc9b8d70f SHA-256: bbd23d5e03bb2e0184cd27a5f00e8f28ac7e1a37811fdd7f92a7f8d4649600c6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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=super+mario+bros+2+nes+free+download PDF link annotation
    • http://musofiron.ru/ximopadoderesl2z35.pdfIn PDF document text
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/puxekez-mugika-tofexatedarafux.pdfIn PDF document text
    • http://rikororasikenek.iblogger.org/camarines_norte_state_college_form.pdfIn PDF document text
    • https://palavelo.weebly.com/uploads/1/3/4/8/134891967/182f010ad7.pdfIn PDF document text
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/guwas.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/wapije.pdfIn PDF document text
    • http://alkostore.xyz/robotech_rpg7k3xr.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/buguvepegenasuz-bevefavuwum.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/fb79ce993d7c98.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/pegevox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_1fb87e5067b64c59be312b1b8dcb44ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/706aad0e-37fc-4022-afb3-53b95f347a65/learn_calligraphy_kit.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_bf0bbdb869764e6d80b4f4f71af3d869.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f902c6-eb16-4ebd-906e-8189b79c86d4/average_cost_of_generac_whole_house_generator.pdfIn PDF document text
    • http://tosawivigibi.rf.gd/honda_generator_2000_run_time.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/buy_laminating_sheets_in_bulk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be51be58-39b4-44a2-9e0b-f6af0c696419/blank_soccer_practice_plan_template_download.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_0b5e322a8f474cc4b4a4e9fe68a5bac0.pdf?index=trueIn PDF document text
    • http://xofafatererowu.rf.gd/bt_infinity_home_hub_2_manual.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_deebaa1e01f14ffa9c3929f78725b0cc.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_1e73ccaabca9434e8e7a977a91d8d31e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/520c392f-d741-4bf9-87ae-205daafde095/mujenuj.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_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 5652 bytes
SHA-256: e03220d3cc5f5afad99550b7812801748e08dd42513a39e7fb9d5248085bf438
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10244 bytes
SHA-256: a94310d42f3e1349ee7c27a3af6418d6879cbee7e2a461d926093f3df64254f4