Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c9c981cf2427c9…

MALICIOUS

PDF

73.6 KB Created: 2021-03-21 07:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b8237d4db1cc0d0e8f531f37690ac283 SHA-1: 06fcb69212b31325907111380dc4eef260766e06 SHA-256: 85c9c981cf2427c9d8e3b576cca6b644741a461a6181e7c7f6c86d0cb7c01455
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious or disposable domains, indicating a phishing or malware distribution attempt. Heuristics confirm the presence of malicious redirector links and a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=biblical+dream+symbols+dictionary+tyler+wolfe+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_60025ceedf2b1.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/10441571186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5fd2cb9050335.pdfIn PDF document text
    • http://govnosiakxws.online/mapusibitivbccbd.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/banking_and_financial_services_act_2020.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/7f5a59c3b4bf39b.pdfIn PDF document text
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/0f34f5792.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/OkkBbgg/xanovajomivuledejob.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/roc_annual_return_form.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/3594902.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/cEgexhg/gosovuwumivukuvidefupe.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/pre_calculus_11_textbook_mcgraw_hill_ryerson.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/axjjAjh/new_free_usa_dating_app.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/fjbjjB7/80438329914.pdfIn PDF document text
    • http://ecoterritory.store/manly_p_hall_freemasonryw790c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_602ba40fef20c.pdfIn PDF document text
    • http://vittorguxx.site/total_gym_xls_spare_parts_australiat84wj.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/chohghl/happy_birthday_cake_images.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/tokuzutewuwivevo.pdfIn PDF document text
    • http://revujutipisan.22web.org/arma_3_install_mods_manually.pdfIn PDF document text
    • https://konizalo.weebly.com/uploads/1/3/5/3/135388679/9b1e24b68.pdfIn PDF document text
    • http://kemytbok.xyz/bonafide_certificate_format_in_marathiq10m0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newixisuzale.epizy.com/xulamakivapobirepuwema.pdfIn PDF document text
    • http://kotojesul.epizy.com/zafivi.pdfIn PDF document text
    • http://nupenujopufidi.epizy.com/is_devil_wears_prada_on_netflix_canada.pdfIn PDF document text
    • http://tilanetojik.rf.gd/21943515226.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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 5684 bytes
SHA-256: 6ecef3a53ad8fa40703b6b84d3b00c87949dfe5462ecc297bf118a4a53bb3d7d
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 10116 bytes
SHA-256: a43316894b6e0749f830daf3332a219f8505acc487a7300a0bb9fa7e397407de