Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2031559131800d3…

MALICIOUS

PDF

78.1 KB Created: 2021-03-01 17:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dc67b455a19b3d39ee00b9c3f39ed4f5 SHA-1: 8b416a6810d52d4f0747d219ffa7625523441c4f SHA-256: a2031559131800d39137c25eece98f700c53bb168f6c89917903c686d6845f06
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/wix?keyword=year+of+yes+shonda+pdf+espa%25C3%25B1ol PDF link annotation
    • http://apkweb.net/apollo_twin_duo_mk2_price_in_indiav5mhg.pdfIn PDF document text
    • http://dalkomis.website/fofemafiftb353.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/can_you_keep_a_secret_sophie_kinsella_jack_harper.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/fWieOKP/dariohealth_corp_news.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/fXYYVUb/fire_horse_wallpaper_free_download.pdfIn PDF document text
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/94d13ce3fbfe.pdfIn PDF document text
    • https://pebujekug.weebly.com/uploads/1/3/4/3/134380671/piworatix.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/bqggehj/secret_rare_pokemon_cards_gx.pdfIn PDF document text
    • https://zokaguwozan.weebly.com/uploads/1/3/0/7/130738936/teselarafigagatoviwa.pdfIn PDF document text
    • https://cdn.sqhk.co/zimevegi/RQS8R9z/62914858797.pdfIn PDF document text
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/907660.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/vrAUidi/bizafibixizimisak.pdfIn PDF document text
    • http://geosen.net/nolobeynwap.pdfIn PDF document text
    • http://reawont.online/how_to_reprogram_a_schlage_lock_without_programming_code9a11e.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/vavejijitatofu/bizhub_185_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/scotsman_guide_top_mortgage_lenders_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/greater_noida_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/ringtones_free_tamil_old_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/xuvobitezume.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_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 5404 bytes
SHA-256: fadd6cc8038b323a4ad464cf9a0c89774362e283b71c6b4a3263ad96003a6cef
font_01_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 10504 bytes
SHA-256: ec874d7207fcdf1e8f5b6ca4770631658475c535a3b93bf6cba1c6cc7a1c97b5

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