Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8c03b796648c7c…

MALICIOUS

PDF

80.6 KB Created: 2021-05-29 04:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ee00c9a315fe0d905af2f0af56d820e6 SHA-1: 133621b856d3ee3eb941ca70d4d8c05bdaeb6830 SHA-256: 6e8c03b796648c7c7a632291cc77d2fff72dda970a44ac420e763c5127be7b35
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://kuzutuzo.ru/strik?utm_term=bir+pletok+dibuat+dengan+cara+di PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456686/normal_6051987fe1a7a.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/07b9502a893.pdfIn PDF document text
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/8fe3dcb4f837.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/634ce5e.pdfIn PDF document text
    • https://zokatitolef.weebly.com/uploads/1/3/4/7/134702636/dd26fc8cfedefc.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/rimuzatixibu.pdfIn PDF document text
    • https://wumotupukivu.weebly.com/uploads/1/3/4/5/134525371/xuziparojorurajopur.pdfIn PDF document text
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/vejedib_mukatusimaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fd67f5dcfb28.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/poxeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478148/normal_6003ae413d9a5.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/5720416.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
    • https://uploads.strikinglycdn.com/files/d102df80-9349-488e-acbe-4332829214ab/5995621302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d87b77-fda0-4deb-837a-98da1f169841/teaching_feeling_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb72461a-a2ae-4f3b-af6d-8b14b7327966/30430296618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864bb49d-de8c-48d4-a0e7-a603955863ab/harry_potter_actors_ages_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45079b0-d5b8-45cd-8d39-d2f3c3513a63/57761458251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda86139-cc04-4e35-b7bd-9b46a5c3d487/arduino_uno_r3_schematic_proteus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ec38f0-7b29-4518-8397-8c9be5c0e993/gobumoxusegediwaranax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e9abff-b301-4228-adad-a77719bb4d41/ekilli_yaz_yazma_program_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fca025c-c6ea-49f6-b8f5-3c9837ddd53a/miriwulepe.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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 5200 bytes
SHA-256: 926d415fbf14812e0deeb89668e4a48e87d61278c9432c6965b0dd4f781e93af
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 11284 bytes
SHA-256: 20a937d0dd273b9cc8303c546589edf52b69d8114d433e092450fe33bc099f7d
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176