Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e781ecbb60f941…

MALICIOUS

PDF

80.7 KB Created: 2021-05-07 13:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6249a33c4545f61e75573a342e9364b0 SHA-1: 210fd381ccfdcf2c6d7fddb61843880dfe6382e9 SHA-256: 71e781ecbb60f941d4224771b11bdc0bff26cd26dad0ded6534a29c28bdf9a81
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=what+became+of+spanish+flu PDF link annotation
    • http://callup.today/how_to_clean_lg_mini_splitgq5ys.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/43222994366.pdfIn PDF document text
    • http://sale20.site/seruxowawikiwenijenilakoznmzu.pdfIn PDF document text
    • http://lurubalopare.sportsontheweb.net/xumuverusevogujizuwewa.pdfIn PDF document text
    • http://jefijunanupe.sportsontheweb.net/xepepuziga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_606e784abee65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5ff8332392e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_60468ca037410.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/23202690294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_606c72f33497b.pdfIn PDF document text
    • http://price-list.moscow/65981605554zs6o2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatugeset.atwebpages.com/4085170688.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/how_to_make_money_flipping_houses_australia.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/flyboys_movie_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7342786-c766-4222-affb-d32ebfb1a8b8/sivebumumutere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a94975-d9b8-407f-b834-5ca7f1bfd24b/58720607636.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/91250283624.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/68716282971.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/incident_report_sample_for_security_guard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc3d136-3132-45f7-9407-9355295dab98/34401588705.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/alfonso_reyes_cartilla_moral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f89da6d-45cf-48a3-950b-013b4a660e08/what_board_game_should_i_buy_next.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/93691375723.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/aplikasi_tuner_ukulele_senar_4.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 5312 bytes
SHA-256: c653a8b840da8c5d89bf2e1a62793ab72dbdcc81da4ce5ca2c4a276d25064ba4
font_01_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 11112 bytes
SHA-256: f76a4cb719aa83bbcb0e5fedfaef67a9c9f088af15aee490ce00a5312255302a

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