Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb6689e60211d29…

MALICIOUS

PDF

81.5 KB Created: 2021-04-01 18:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 176e4a581ef2c63a89a819e26be169cc SHA-1: 1a1ca64aa826d44933ff4023ee1dcbfcebc2835b SHA-256: ceb6689e60211d2946ed9e854f23196edca3967a00e7d10a60c15cf6b18b99e6
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 0.9994

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://dafemum.ru/strik?utm_term=toro+self+propelled+lawn+mower+repair+manual PDF link annotation
    • https://cdn.sqhk.co/gasukatebu/hahgmpz/asa_5505_security_plus_license_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_60207a619cbd7.pdfIn PDF document text
    • https://popewike.weebly.com/uploads/1/3/1/4/131407195/tuxagebenimavuk.pdfIn PDF document text
    • https://xojumupaxasa.weebly.com/uploads/1/3/4/6/134605953/sofotososurugag.pdfIn PDF document text
    • https://xipuzitob.weebly.com/uploads/1/3/4/5/134523495/gugidonexib_sujixofe_fefotuvamefijin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501484/normal_6003fce936e75.pdfIn PDF document text
    • https://cdn.sqhk.co/sekeniti/hhIhjBs/sikajazijove.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/hidhhhi/hide._io_play_now.pdfIn PDF document text
    • https://tufobedix.weebly.com/uploads/1/3/4/4/134431979/zugarobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_6032c6cfb9e71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389352/normal_5fefc8ff819c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_6016b6a611041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5ff6d3e0c8353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478947/normal_60018256477e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_60354fd7d4975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_605903a93022c.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/isih4tQ/51097377360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_e323859f52b4424bb9c7ae7b9311fbf6.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_f111c4b6605e4d5db0883890af161fcf.pdf?index=trueIn PDF document text
    • http://muxajetolalet.epizy.com/mindful_colouring_sheets_printable.pdfIn PDF document text
    • http://xatamiv.rf.gd/3781162445.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_0c838f40c58a4adcb0303c1cbef6faaf.pdf?index=trueIn PDF document text
    • http://robefopatobut.epizy.com/aqa_biology_a_level_student_book_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_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 5228 bytes
SHA-256: 3fbaa7bd2c916d24994a4e35237a652b65c812aae79e97a573417cc2bd209a0b
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 11124 bytes
SHA-256: 387006e41399145e35038ff6dbf9d349c21025642f41ad2b7394fde43b2bde64