Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab11e3928c7911aa…

MALICIOUS

PDF

85.8 KB Created: 2021-03-15 06:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b2d349c3a435512cf393ddc050397877 SHA-1: d1f3af9937966a1517207535f351bf521eba7c83 SHA-256: ab11e3928c7911aa6a170c26bc9347beaf069378a63484af13e00cced368998e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/wix?keyword=bridgman%2527s+complete+guide+to+drawing+from+life+5th+edition+pdf PDF link annotation
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/491731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490256/normal_5ff3927c434b8.pdfIn PDF document text
    • https://pomonomiwubexi.weebly.com/uploads/1/3/2/3/132302815/gizibipisaw.pdfIn PDF document text
    • http://repair-planshetov.ru/gauss_meter_flukenx0xo.pdfIn PDF document text
    • https://lonexababite.weebly.com/uploads/1/3/1/1/131163854/fevavolobi.pdfIn PDF document text
    • https://lesavamu.weebly.com/uploads/1/3/5/3/135347369/6166364.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/xhhjjhh/dekuguzufogenaroxine.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/kMzv6mE/99503295222.pdfIn PDF document text
    • https://kilekofizinovi.weebly.com/uploads/1/3/3/9/133997912/nuxali_nigakurupuf_tosere.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/1cf9fa4606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_6019f5d7da700.pdfIn PDF document text
    • http://mapenibo.scienceontheweb.net/beck_s_anxiety_inventory_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_60216c2a7a6af.pdfIn PDF document text
    • http://arenaprobet.com/36339962518cic8j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fc8da74e77b8.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/c2d9073c45e8a92.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/6Yz0SCv/invaders_of_the_rokujouma_episode_1_eng_dub.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/cebuano_tagalog_dictionary.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/91733337618.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/8UCUjgc/bleach_gba_games_free.pdfIn PDF document text
    • http://gogogoinst.xyz/pefagajukd9gn2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6014b1db6e6f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujimosodaza.myartsonline.com/sex_and_the_city_2_cast_names.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/50878424911.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001212b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1212B 22236 bytes
SHA-256: 405ea2836d2cff73904bb46e0b8118b696db96988db88ea68560e842628f2541
font_00_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 5868 bytes
SHA-256: b3a5e1fa5b106acf4f55c6506daa0b2b03e94f88659c0b5f8cc37a81a195aa62
font_01_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 10144 bytes
SHA-256: 440420039451406d1c2011a562311a098914aec34bdde3689ddd2232924181e0