Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed0e8772e5d88c2…

MALICIOUS

PDF

78.2 KB Created: 2021-02-24 21:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4668f0a38e5a44f9a802e438e313e245 SHA-1: 397a5f862052607c364c79582ff03fd166539aea SHA-256: fed0e8772e5d88c27903b01635739cbf49c3735bef19cba25d3b1ef324267d14
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious or disposable hosting domains, indicating a link farm or phishing attempt. Heuristics confirm the presence of malicious redirector links and a high ML score for maliciousness. While no scripts were extracted, the structure and URL distribution strongly suggest an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=running+fred+mod+apk+revdl In PDF document text
    • http://afracheat8.xyz/treasure_island_comic_booky9iog.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/demadazapiwawikapuxigafo7fmcl.pdfIn PDF document text
    • http://affilateapp.online/poruwavipelizok732hh.pdfIn PDF document text
    • http://tuworiki.22web.org/79787740115.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/haRhghh/walking_dead_season_11_actors.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/do_weight_watchers_scales_need_batteries.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/toshiba_ct-90325_tv_bluetooth.pdfIn PDF document text
    • http://reduslimitalia.site/epilogue_the_dark_duetlxk3e.pdfIn PDF document text
    • http://akmurzina.com/neil_gaiman_short_stories_rankedrjnc2.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/ahdpjjQ/8_ball_pool_unblocked_miniclip.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/hbXDYhb/5973525552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donijexufenu.onlinewebshop.net/ferurenosipupepe.pdfIn PDF document text
    • http://vemireme.epizy.com/pulse_secure_host_checker_windows_10.pdfIn PDF document text
    • http://sakupoje.epizy.com/android_studio_codestyles_project._xml.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/web_hosting_responsive_templates_free.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_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 2880 bytes
SHA-256: 80960c5ef920dc812f40421d0c41ad5272b60f71c1256c1bdf7a11afd8d5b2df
font_01_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5316 bytes
SHA-256: 436c8900f96b72b94ddbe63a4f102a4451dd41530faf100db0c38e7bfd200d08
font_02_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 14532 bytes
SHA-256: 93d626f819a3be795788a093aec467718d8fdb90188619cd08aba0d4183ecc4e

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