Malicious PDF — malware analysis report

Static analysis result for SHA-256 20115c12294e0f3f…

MALICIOUS

PDF

75.4 KB Created: 2021-04-21 10:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b127c07ef29c706853cd9c9d1f51bada SHA-1: 921b462160ef718c9814a472dc9882fab844e8af SHA-256: 20115c12294e0f3f0b86808413cc4b04a96f1e5ff3844139f4431d52e7429bc2
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Fallout 4 dlc level cap' and an embedded URI pointing to a suspicious domain. Heuristics indicate this is likely a phishing or malware distribution attempt, with ML and ClamAV classifiers strongly flagging it as malicious. No scripts were extracted, but the presence of an external URI suggests a download or redirection to a malicious site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/strik?utm_term=fallout+4+dlc+level+cap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fd3553369a8c.pdfIn PDF document text
    • https://cdn.sqhk.co/wovudojemu/Whbigc2/gimadebutifatonewosanig.pdfIn PDF document text
    • https://cdn.sqhk.co/peporewav/iujgltl/r_b_music_videos_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422914/normal_60074fba49097.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/bhcVhdH/ncaa_women_s_basketball_coaches_salaries_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_5fdae45cbe0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_6029b366666f9.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/ISmjeii/university_of_montana_law_school_admissions.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/jjsjc2F/65892176293.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/35968012693.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/hccgfgc/root_checker_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/hig2id8/74763785358.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/SZ5hgSp/xidenuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_604ee7137edd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josuxak.atwebpages.com/lnmu_bsc_part_1_zoology_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60a054a-ce2b-4c96-9e18-2ce678dd8569/the_psilocybe_mushroom_bible_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bee2b4c-9a72-4ba5-8794-7c8e661d2045/78685388619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff99fef-1473-490a-ace8-de1fbc360236/49837656500.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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 4896 bytes
SHA-256: 6727831b4a49c2373f3ea69b3aec1ec8f93d16f5d5552240b0bb4ddd2b56e7a4
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 10812 bytes
SHA-256: b92cea7d35d6b92fdcb8f54ae89c8fefaf2e05683cabdc57a6caa1196623c8ec