Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97bce68c8ce7e6b…

MALICIOUS

PDF

76.7 KB Created: 2021-04-04 00:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 49b2b2418ce0db27a5c6258808dfef4c SHA-1: 6e6d76feb241d1736141099be6077e49972e1333 SHA-256: c97bce68c8ce7e6b250cf724436cbc1424ec7917084e199afc16d21e67352aca
186 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, indicating a link farm or SEO poisoning attempt. The primary URL suggests a lure related to 'Sears online assessment test answers 2019' to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=sears+online+assessment+test+answers+2019 PDF link annotation
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/xamitebozebizat_zitibux_rijovowutadexob_fojuforobikami.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/iZKieha/betasulizetudoxawujatoros.pdfIn PDF document text
    • https://cdn.sqhk.co/dewobube/uid5jY2/zufoberemiduzugozis.pdfIn PDF document text
    • https://cdn.sqhk.co/mozozezowos/gjigjHH/mens_fall_wear_2020.pdfIn PDF document text
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/jexixo.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/D3PjjC5/area_51_green_grandpa_alien_game_escape_room.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/366073.pdfIn PDF document text
    • https://pavibizad.weebly.com/uploads/1/3/0/7/130740264/marilarozubi-nopufujuk-feguvarob.pdfIn PDF document text
    • http://gbo.guru/1554089299807cgz.pdfIn PDF document text
    • https://vazozedirasamib.weebly.com/uploads/1/3/4/0/134013018/51e07cc3.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/1f098.pdfIn PDF document text
    • http://future-techno.ru/important_parallel_lines_of_latitudesp67e.pdfIn PDF document text
    • https://tawixepew.weebly.com/uploads/1/3/0/7/130739069/fizata.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/xewojizuto.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/igCucd4/infection_symptoms_and_signs.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/44357965386sdggl.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/jSRjggj/39547476713.pdfIn PDF document text
    • http://masalev.ru/excel_vba_learning_free_ebookskkxmc.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/1669875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_b82242e67784455b9029947eb491f0c3.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_7867ecf0969f4d42b3f802ddf50596c5.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_848be7daacf94c7ea9a0feaef37888f6.pdf?index=trueIn 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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5508 bytes
SHA-256: 44389eafc7db6f02eb418eb47318d530ddd05675fa7ba439b38841978c62a5a0
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 11416 bytes
SHA-256: d3e170ccf1d98e8810a7285e791c67a71dbd2782a5370409972a82e1f944d896