Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bfbca30516eb5b…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 10:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5ef4ce3787631f2d1ad6ef77b480af6a SHA-1: efa55c00d8996541c701232760a66ff9ae505217 SHA-256: 56bfbca30516eb5b74431fd758ce03f5349f412b31414f800e21878da2b24e3e
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or subdomains, indicating a link farm designed to distribute traffic to various malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=lean+on+me+movie+dual+audio+download PDF link annotation
    • https://cdn.sqhk.co/geruxibab/Rjejj5e/app_to_get_more_likes_on_instagram_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/cIhdhem/fililajimenaliduzus.pdfIn PDF document text
    • http://f13x.xyz/snapping_turtle_bite_woundowauf.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/ic8Drgg/8790987234.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/jhhaghe/cross_stitch_patterns_free_baby.pdfIn PDF document text
    • http://blekrossi.ru/how_to_do_log_on_ti_89_titaniumot4l1.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/what_is_schrodinger_wave_equation_derivation.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/numadulosinis.pdfIn PDF document text
    • http://price-list.moscow/jump_on_it_fresh_princexocde.pdfIn PDF document text
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/papapopa.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/UPYhiEf/ben_coloring_10_ultimate_alien.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/WTm1P7Y/the_boy_in_the_box_book_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/gK6ZUha/45516432987.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/5216772.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/YjcfkH3/vegubagamofexorutozugid.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/sefojoxi.pdfIn PDF document text
    • http://weridif.medianewsonline.com/gosulamutikeru.pdfIn PDF document text
    • https://vamugibamapiju.weebly.com/uploads/1/3/4/5/134588186/pubegapezopofukat.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/vofigasosev.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/microbiology_laboratory_guidebook.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/how_to_use_document_analysis_in_research.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/5426146.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 4792 bytes
SHA-256: 1effa7548482a97b9beda63857786db526117c0d2092641349ca439732ed712c
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10812 bytes
SHA-256: 20876c30351e50f51a9539f98a7024026f1acfd5c0281bd76b304a6d6d27fe51