Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c533e3446b8e1f…

MALICIOUS

PDF

106.9 KB Created: 2021-02-22 14:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7970b64af4b86ceaf59ee982f51d21c5 SHA-1: 2a98f5a7e65d4f544fc56b74d5ce3bb26dd501ce SHA-256: 82c533e3446b8e1fa9be6bd78eb6965206cdaea11a48ac38db2bf3c55cd4767e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though partially garbled, suggests a lure related to political systems, which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=tipos+de+sistemas+pol%25C3%25ADticos+pdf In PDF document text
    • https://cdn.sqhk.co/muvenetu/fKsx4Bh/age_of_empires_apk_mod_offline.pdfIn PDF document text
    • http://axacheat4.xyz/animal_farm_movie_1954_trailerc17ma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_6023da983d443.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/d9gb5og/k12_online_school.pdfIn PDF document text
    • http://center-san.ru/sololearn_coursesecnbz.pdfIn PDF document text
    • http://ita-talia.fun/21388592300j33r9.pdfIn PDF document text
    • https://cdn.sqhk.co/wiparodub/fighNx3/golf_magazine_top_100_courses_in_the_us.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/hgfhbhe/basketball_stars_unblocked_games_66_at_school.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/GBzhggi/juventus_team_news_champions_league.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/4jekLja/33513919750.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/GATjije/melody_thomas_scott_son_age.pdfIn PDF document text
    • http://hookup154.online/xaxokirukiwaravubuzirewu0gy2y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabepekepino.epizy.com/wazofazomediso.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/51129041619.pdfIn PDF document text
    • http://gixopesibesuges.epizy.com/zajerevuxibapejodobetiko.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_off00016496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16496 5208 bytes
SHA-256: 8421231880241b60917537417a922b04f630d1d566b349df5eb240341666c45c
font_01_sfnt_off0001763f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763F 12056 bytes
SHA-256: 62d2f0c21e9cb5d4760efdd7adfec625d1fe3de53226d7c5b24251875fd7ea16

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