Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6359773d29d203…

MALICIOUS

PDF

81.4 KB Created: 2021-04-04 09:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 893ecd9775d249b2bd704e8e0a996c77 SHA-1: c59cb8ec18cf9ca93ea95990c61e9091472d03c7 SHA-256: df6359773d29d203d1876324995bb610434085bc8f1c270026fe6d163f1df3d3
194 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, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a social engineering attack to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=ap+chem+frq+2019+answers+reddit PDF link annotation
    • http://netewe9.xyz/29622247431muzvg.pdfIn PDF document text
    • http://photoforce.ru/logitech_mk540_advanced_revieww4fd6.pdfIn PDF document text
    • http://dajazadek.22web.org/84029774027.pdfIn PDF document text
    • http://auth02mobility.com/analysis_for_financial_management_higgins_download90b19.pdfIn PDF document text
    • http://goxadonivibifiw.22web.org/guzebapote.pdfIn PDF document text
    • http://onlyforyou.space/what_to_cook_for_indian_dinner_partywsifr.pdfIn PDF document text
    • http://flowerport.store/rexexi5fm9d.pdfIn PDF document text
    • http://idem-peshkom.ru/punctuated_equilibrium_model_examplesizlhj.pdfIn PDF document text
    • http://changepass.online/lovutunakalitanugun0m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://366cd995-4ddf-4220-a197-7cea849caf0e.filesusr.com/ugd/947062_a349c65abb91406f96fccc9c4ffae6a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e1232b-859d-495b-bcfc-b2a2a9515d47/riwisezib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2b3de7-2047-43ff-93a5-8dc3d68b7dfc/how_to_calculate_indifference_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3b5a0e-4de0-45ae-9af6-dd7b61f8236e/53506951704.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_2599ba13eacd4da4b2ff24e5473c8bf8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0bb75b-c81d-42c8-8e9d-d34280f3b299/22675991993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b70b38-3e41-4962-8cf6-d4df619418ee/wefodisekazixidefolopetug.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/55290230922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c188aa09-acb5-4cfd-9e97-c4a8d12fb857/armitron_45_7012_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34877a35-6a29-4b0b-b965-47351a20085c/68127128209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f940ebf2-9339-4c1c-abca-866108ade7d4/bowflex_pr1000_workout_app.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_af77ebb5dddd43329ee7a0f2396333c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d52b15b-43d4-4a4a-97d7-ee1e0f3d45f1/how_do_i_connect_my_iphone_to_my_home_wifi_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4c5f38-b2f4-482a-abc6-1a53e276200d/zupirimolujizuxol.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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 6052 bytes
SHA-256: c1d60ef3a8caab1c03b4b72dd8df6cb01bb41b0f2e335e5b19d11a9ed46a6c8c
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 11836 bytes
SHA-256: 7ab67cefb230b9576a78c998a28d1555340f53f994be3e3c7810c5525fecb595
font_02_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 16116 bytes
SHA-256: 586fd2d47d7ef655ac8fcedaf3a17ac43b55ee34544d24df6525aba8b365c669