Malicious PDF — malware analysis report

Static analysis result for SHA-256 456799c87f1dc358…

MALICIOUS

PDF

92.1 KB Created: 2021-02-24 08:37:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 10526f507febc0af502890ebb108f231 SHA-1: eaea21f491dfcdb18af62f3f1c62ddcb2f885cfe SHA-256: 456799c87f1dc358d6f3e9f4058aa5b3221a19835d126621048c2d9c123e5f45
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to external, potentially malicious, content disguised as a manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=hoover+power+scrub+owner%2527s+manual In PDF document text
    • http://nivawegokex.22web.org/episode_guide_blacklist_season_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478383/normal_5ff49e0c9c1a6.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/Thehhh9/fried_snapper_fish_tacos.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/jgdyjat/ghost_rider_2019_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5feb94e2bdc07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_6018b65dcfcff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fdbd14619e69.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/cNYogdx/ragdoll_warriors_roblox_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/fusojafiza/chdhija/sabumonowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_602a04ff9d903.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/garukorutalunutopubos.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/gbwhatsapp_latest_version_uptodown.pdfIn PDF document text
    • http://vapufebifuv.epizy.com/npm_err_missing_script_android_react_native.pdfIn PDF document text
    • http://tevufojetuxovud.rf.gd/android_check_sdk_version_runtime.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/kolukodaxus.pdfIn PDF document text
    • http://lakekawe.rf.gd/84234794838.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/bronson_movie_dual_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/chrono_manager_auto_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/anthem_ayn_rand.pdfIn PDF document text
    • http://mawabubobiniz.rf.gd/daforovufexo.pdfIn PDF document text
    • http://vibesegajepo.epizy.com/treatment_of_anaphylactic_shock.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_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 5364 bytes
SHA-256: 11d645b06c526534c1a08bd2daa5f90e24bc135b3a1e42707ac20093c48e6aff
font_01_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 10840 bytes
SHA-256: 816ea6f316089756a576d45faad659e4e80741c319706fca9f04919dfa54812c

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