Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bad3198a7f76c5…

MALICIOUS

PDF

77.1 KB Created: 2021-03-12 14:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c66d519a67adb157b2639edc8f27bbda SHA-1: e2fb1b638e45e1e68a8d34eccfb5077054d98119 SHA-256: 16bad3198a7f76c54ec0636acc73a15d1301ec46d0767e18ffd6ac059edc47bc
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external URIs, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the presence of many external links indicates a likely phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://resalured.ru/award?keyword=corona+render+settings+pdf PDF link annotation
    • https://cdn.sqhk.co/mugapowejog/hc7CScf/race_car_wreck_yesterday.pdfIn PDF document text
    • https://jasuniwe.weebly.com/uploads/1/3/4/5/134515850/xirufomodo_movob_revelevozimufo_debuti.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/brhehgw/nufoxinuderekurerelon.pdfIn PDF document text
    • https://cdn.sqhk.co/romekeka/fIhfhjm/novel_application_areas.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/fjfgo9N/bolo_de_chocolate_fofinho_em_forma_retangular.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_603b2174872e2.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/4250350.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/tabiwifini-jomefe-lebotobenabo-sebavusenif.pdfIn PDF document text
    • https://gavuwexis.weebly.com/uploads/1/3/4/7/134772394/640696.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/povev_jimesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384310/normal_6006a124c4e8d.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/KTiegdR/36463194369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_dffa065c35d64940934c1a4edffad344.pdf?index=trueIn PDF document text
    • http://kebipilukav.rf.gd/74327586818.pdfIn PDF document text
    • http://xevupan.rf.gd/looney_tunes_theme_song_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/73304478560.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/forgotten_fire_chapter_17_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/employee_complaint_letter_to_human_resources_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/61094221934.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_60fa5013995a4ac9a6bd86d4fc9e3186.pdf?index=trueIn PDF document text
    • http://wufuxoponuwuros.epizy.com/moxuvoxenigi.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_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 5084 bytes
SHA-256: eb77d7905b0204f3e2a91c95f36a7ff4c88e4cdae9f00fe5daf1849a25a84abe
font_01_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 10672 bytes
SHA-256: b26bdc71a606a819b93fbcc3296478ac6fd11ab7c7d009d57d555800de543ff8