Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1839313d16d273c…

MALICIOUS

PDF

69.8 KB Created: 2021-04-06 01:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40dbf414b613694dee1e7c389e4538a6 SHA-1: 720bc1d5f5ec547890edc30cb2404a27044d6a33 SHA-256: e1839313d16d273c45c516bad8a06a826903b3a75fc469ce98e5aff244fe39f2
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 0.9996

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=harga+mixer+behringer+xenyx+qx+1202+usb PDF link annotation
    • http://zirekafeti.iblogger.org/97310455788.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/inflammatory_bowel_disease_in_dogs.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/java_programming_mcq_questions_with_answers.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/magup.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/56913959808.pdfIn PDF document text
    • http://zakemelevij.iblogger.org/concrete_admixtures_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zafokofebub.epizy.com/namaj.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_b788848cc64b448db26210248b2f1e52.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_a99d3cb3edc148eb8ed8e8b9457cfcec.pdf?index=trueIn PDF document text
    • http://gonidiwofove.epizy.com/jazar_vehicle_dynamics.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_42d7f5eaf8f1472883bc7d27850e9313.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_28393de729b949b9905cd1eca1cf4a01.pdf?index=trueIn PDF document text
    • http://nisovuf.epizy.com/awadhesh_premi_2019_ka_video_mp4.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_3d19d25bcbf9405da3c35bae1611183a.pdf?index=trueIn PDF document text
    • http://videwebik.epizy.com/arduino_mega_documentation.pdfIn PDF document text
    • http://pabipinipimano.epizy.com/kejuvatosufaze.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_d52ac3d728f44223b4ef435a812e7834.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_1b5db34eaa574365b5f279ce8d54eb9b.pdf?index=trueIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_2c5bbfbddbad46a7bf22e419086e576e.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_a7b8ac2c9f9b4c4db518f54ee2bd7636.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_af1d73b530dd4828b5dbb8031df5d021.pdf?index=trueIn 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_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 5788 bytes
SHA-256: c8b1df24a215cc34ffc0389595d2f481578195fb89ce02948480b799058c6a2a
font_01_sfnt_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 10344 bytes
SHA-256: ecdf9644e1dc86254f85c4a7ea66d50fb57007f7258dbdb175cee7e247fa9d3b