Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b417645f8ecc99a…

MALICIOUS

PDF

115.4 KB Created: 2021-02-23 01:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eb9237d354729e177b293ebfbdd83123 SHA-1: ae02f98708b63fdea342edcb7df1b3a75fe99125 SHA-256: 0b417645f8ecc99a4bdc6f5029744978a69c3b79eebcd71982249a4af0a61a8a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm hosted on disposable domains. This technique is commonly used to redirect users to phishing sites or to host malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jacksth.ru/strik?utm_term=at%2526t+dect+6.0+2+handset+digital+cordless+answering+system+silver PDF link annotation
    • http://sqrab.top/kanukuka46ey.pdfIn PDF document text
    • http://normal-id.com/5_love_languages_for_child_quizryl1b.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/BfdiggH/stickman_arrow_master_legendary_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/zhfidoM/99915590239.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jjUgjKw/jipovovej.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/10242704414cenx2.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/v3ahbje/knowledge_is_power_quote_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529087/normal_5ffb5eff225fe.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/id1zphW/mawovesopizuratusali.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/566108.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/Riajdig/ultimate_guitar_chords_tabs_apk_mod.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/10278095650mbwrp.pdfIn PDF document text
    • http://hookup755.fun/kayn_aram_guidelxb6z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_60278a5084396.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/fAAJysU/huntington_woods_mobile_home_park_greensboro.pdfIn PDF document text
    • http://labincom-med.ru/3320020376874fxh.pdfIn PDF document text
    • https://cdn.sqhk.co/julubesaf/cYjgg3H/xofoxabetexusujoruzip.pdfIn PDF document text
    • http://prodive.su/tosunonixuwamogukudofixzzg8q.pdfIn PDF document text
    • http://vigastlens.xyz/foxaguvedegarozq99z.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCB 5648 bytes
SHA-256: 181a3baebeb2ff23a3494c638060230259d94adcd82404b23f213d705cadea09
font_01_sfnt_off00014fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB8 4144 bytes
SHA-256: 7d3a719a45dbe4bb54c9265ff72a0838cbe1c47c5387598d1022aa94f12bb21a
font_02_sfnt_off00015dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD7 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_03_sfnt_off00016937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16937 19628 bytes
SHA-256: c2e420d8269be217aac223f4bdf24fa4a19fb26342e6259e6596f8433ce52acf
font_04_sfnt_off0001a27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A27F 18148 bytes
SHA-256: 70fea695fa5b885a7d93b9bb2f806abdab3a5ba69a94a710ad984af98f55e37f