Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7633ada366151e4…

MALICIOUS

PDF

83.6 KB Created: 2021-03-20 15:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 98942672d3153a4aac2915dc05ed6b26 SHA-1: 6b77818e08f3658380fc13f0a57a2bd52099d469 SHA-256: a7633ada366151e4c4557838f675cb7ae5f3cd70c649df02a08bd59a60645cf6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and a link farm indicates an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/aws?utm_term=sat+subject+test+chinese+with+listening PDF link annotation
    • https://cdn.sqhk.co/rekubapapup/hjfldjh/drop_him_off_in_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fec1afd69dc8.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/B43hhhg/sandbox_app_parent_review.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/jauJE9g/wobosodol.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/8DZ09vP/find_hidden_objects_in_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/gjfhep5/latest_viral_video_2020.pdfIn PDF document text
    • http://salimom.mygamesonline.org/advocate_gatos_bula.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/agisoft_manual_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/suzagofi/hUZ8Mhb/36945655790.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/billie_jean_guitar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_6009e2e679af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6010e31d73987.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/iilgc7a/gwent_the_witcher_card_game_android_release_date.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/what_fluid_do_i_use_in_my_allison_transmission.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5fd2eba24870b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_e3922d44874b499f92a6445636a5076b.pdf?index=trueIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/pinetoxesinodijibedowofi.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/tetinonavasujenidudoro.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_7a95ae985cce471295333d781caba9fd.pdf?index=trueIn PDF document text
    • http://fixidil.atwebpages.com/tebowefotumolejikunosima.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/are_schwinn_spin_bikes_good.pdfIn PDF document text
    • http://jowosos.myartsonline.com/74123112741.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_020e15522f8343eabe57b3d0c166b44f.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_4886f65d50724d49840e65b5956ca11e.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_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 5376 bytes
SHA-256: 66d1eaf7d71cce06ac31d5a85181008a6d0650fdb67058c349f7b4336b27aeec
font_01_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 11464 bytes
SHA-256: 20732ca597c8ce47e9d6bb21069634097f09c1a7d3e5f47a6f032a224ec71fcf