Malicious PDF — malware analysis report

Static analysis result for SHA-256 5665c9819a47f3fc…

MALICIOUS

PDF

76.6 KB Created: 2021-03-01 03:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b1303134652c14a6332d6058d498e66e SHA-1: d539109e6ac76866570eedb0d3076e9ad3dd3e41 SHA-256: 5665c9819a47f3fcdb752f68c229057370f8b72fa71cb1e923540c314a0575c7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded links and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=organizational+structure+types+in+english PDF link annotation
    • https://cdn.sqhk.co/dofexoxev/l6khiib/limiwepixofofugasula.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/Tzhaigd/cinemark_ecuador_village.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/500500.pdfIn PDF document text
    • https://cdn.sqhk.co/zutijujes/dsjbgh3/cold_war_proxy_wars_timeline.pdfIn PDF document text
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/3678039.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/fghijUY/33250247394.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/aJDLez7/business_administration_degree_online_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_5fd793012d037.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/giivBhc/18430175876.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/ibjeoie/strawberry_shortcake_dress_up_dreams_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/Xibhhij/50421852096.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/mikunarudatevatuf.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/icZajfE/i_love_crosswords_2_level_34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://babudenipovux.rf.gd/paint_3d_apk_for_pc.pdfIn PDF document text
    • http://nabiderafiwo.epizy.com/91216008607.pdfIn PDF document text
    • http://dilalixurapa.epizy.com/doranavenegu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 5376 bytes
SHA-256: 998bf87a055c1c7f2bb33704258c77c65e889cf3f8f580dda0e586dcc883c084
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 10164 bytes
SHA-256: d861d36e1971212fb0971987b54e808646927eb67c2904d5397e6c19fe578647
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 16088 bytes
SHA-256: 440dba4c268e2299b52e2c49489de8471589ecb80494ee41743e91195df941c9

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