Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4482a792975757…

MALICIOUS

PDF

94.0 KB Created: 2021-03-24 19:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a746c6f3e03b820cee25fc9bdd989403 SHA-1: 48db2cc46c95987d3ec8352745a2ca5ca334bcde SHA-256: 0c4482a792975757d44b05f91b7d8f2332bbd3165f8798bf3f43e0c0deb6d183
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm designed for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs and the nature of the link farm suggest a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=text+structure+anchor+chart+printable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387929/normal_601c6b3497403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373770/normal_60041d511aadd.pdfIn PDF document text
    • http://greatholl.com/why_is_my_gas_furnace_not_blowing_hot_airicrlj.pdfIn PDF document text
    • https://miletobe.weebly.com/uploads/1/3/4/8/134860907/1209511.pdfIn PDF document text
    • https://vatovuturok.weebly.com/uploads/1/3/1/8/131856009/7083267.pdfIn PDF document text
    • https://notozovurex.weebly.com/uploads/1/3/2/8/132814393/d1d019748dfcc.pdfIn PDF document text
    • http://mkr-olimp.info/anarchist_cookbook_original_1971_ebay6pn0z.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/ijqlCjf/zalo_nearby_friends_not_working_2019.pdfIn PDF document text
    • https://tetomorefaboma.weebly.com/uploads/1/3/1/3/131384600/157673.pdfIn PDF document text
    • http://vuvuga.xyz/85588542818eppp0.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/vevowo-lufenupavi.pdfIn PDF document text
    • http://fc-aromat.ru/cat_in_the_hat_bat_meme_template00ffr.pdfIn PDF document text
    • https://fadusibolene.weebly.com/uploads/1/3/4/0/134042843/408fc5c.pdfIn PDF document text
    • http://legendnat.space/instantaneous_velocity_formulausmle.pdfIn PDF document text
    • http://jadebey-x.com/785292455935viat.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/jdpighe/zowobe.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/iMhjhcJ/11027201959.pdfIn PDF document text
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/tufojakadere.pdfIn PDF document text
    • http://usesoda.pro/mcs-150_update_costdbpyu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_5ffdb58bc15a8.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/56cd9.pdfIn PDF document text
    • https://riganekonima.weebly.com/uploads/1/3/0/8/130874133/nijagegi.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00012faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 5176 bytes
SHA-256: 61b59b04d51c3413b0b11b3925e61e7ad6cd006239ae53ffaa5950b3797ce525
font_02_sfnt_off00014145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14145 11848 bytes
SHA-256: b419b5358ec9e43b7f01b1cef02ee4077c0c2effa2d9b6f92f1303848c1c4758