Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d70de5d85ccea45…

MALICIOUS

PDF

74.9 KB Created: 2021-02-26 01:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a49f4b9e295af7c4dbbbb2f93cfa0dc3 SHA-1: cc29cdabd91768dd6c78f3ee48af6e749a5487cb SHA-256: 8d70de5d85ccea452211adf41dc11dfa0b3ad23be1f4546a3a792797427feaff
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to lead users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's part of a campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=amelie+comptine+d%2527un+autre+%25C3%25A9t%25C3%25A9+piano+sheet+pdf PDF link annotation
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/kigafoja.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/645081.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/6f7e9bf5534d3.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/xibujaM/best_car_racing_game_for_pc_under_1gb.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/kedakivodaba-sewapaxalep-dolomitoga-fekosovufagepa.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/i2qijjf/26729208784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_602f63a18ba59.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/jDghdhg/fijomovuwulubatisur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_6013bb93e4b6e.pdfIn PDF document text
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/7886629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_5fe9115abcfe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5ffaa63d6b360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wolobugoxew.myartsonline.com/how_to_play_dd_for_beginners.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/calories_in_dunkin_mocha_swirl_pump.pdfIn PDF document text
    • http://gelodolisez.epizy.com/java_vm_64_bit_windows_10.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/dish_wally_wi-fi_usb_adapter.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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 5560 bytes
SHA-256: acba2068af2602927afffc3bbf37f56ca231cf13b576dad1527ae7be8d0aa76b
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 12408 bytes
SHA-256: 70e46894aad284c1ca1c8a1fcd9ee81c157966810a8113d509c389fd25ab5638

Open this report in the interactive analyzer, or submit your own file for analysis.