Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4201e8c5b91b27…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 22:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a35c279c8ed9e52511f63c10b23013d5 SHA-1: d317bbb0373a50836b0b12d7c728aa0f0bd3e040 SHA-256: bc4201e8c5b91b27f9fb88dce5bb0e2643b304c0cba7312ac28705f860bc07f7
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious redirector infrastructure and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific malicious link indicators further supports this assessment.

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://crophysi.ru/award?keyword=auger+mining+method+pdf In PDF document text
    • https://cdn.sqhk.co/dejowipapoli/ghic92f/era_of_celestials_invitation_code.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/tewibeniwis-mawurovagonox-woxakexogudepet-kofefokesitipir.pdfIn PDF document text
    • http://masajsalonunuz.com/gaxaborafu5vg8q.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/fhfidhw/coloring_pages_halloween_online.pdfIn PDF document text
    • http://bobr.space/57814074338ficn8.pdfIn PDF document text
    • http://tb-films.ru/22620329575zvqz9.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/jhfgjXp/inotia_4_best_team_for_assassin.pdfIn PDF document text
    • https://nulijuvak.weebly.com/uploads/1/3/3/9/133986618/9653818.pdfIn PDF document text
    • http://hookup158.fun/zodebifarusalezomaoks2m.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/d8346a6.pdfIn PDF document text
    • http://pumba-timon.space/how_to_calculate_interest_due_on_a_loancmjdq.pdfIn PDF document text
    • http://triple-doska4.club/fagimulibifefebobibadw8te.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/attestato_di_frequenza.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/pikosolimidafexadomem.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/arabian_nights_in_bengali.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/bijuwutisulox_vovizixitaba_fasojuferafufom_ziwakab.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/49840021294.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/RiRjcjd/22597397911.pdfIn PDF document text
    • http://otomail.business/nasepoj2fef.pdfIn PDF document text
    • http://all-system7.xyz/simple_rental_agreement_form_albertawi8mg.pdfIn PDF document text
    • https://cdn.sqhk.co/bokupajokim/dBIZuji/common_treatment_for_skin_infections_in_athletes.pdfIn PDF document text
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/9d7989687f0769.pdfIn PDF document text
    • http://gvidilon.ru/washington_football_schedule_2020ivqu8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekusisit.atwebpages.com/43453825768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc9e418-58df-45ea-bed2-d855039d4458/attack_on_titan_anime_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb15c788-cef5-4c32-9ad4-51a44bb8974c/93584784283.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_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 5024 bytes
SHA-256: eb2854c73f866ec7956d21f117a1772b2d912c9ba1f006e1c3305de3cf207a7d
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 11360 bytes
SHA-256: 7383b68900a810ef63afee3424abc482f1e7e86111ddc65aa5bfe6d93c7758b3