Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1dad885e6b5cb5…

MALICIOUS

PDF

77.5 KB Created: 2021-03-07 10:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e25263cdcc1f054c02f870df5da78dbf SHA-1: 689dd7d04a2e6a90975fc209d6b965c85d3df91d SHA-256: ee1dad885e6b5cb5bef86eab4b0621654c33522806b904f27800f1b710555d65
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 0.9991

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://xajibur.ru/123?utm_term=what+is+the+best+piano+teaching+method PDF link annotation
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/sagufoduxok.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/hgThjrS/escape_room_mystery_word_level_114.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/vidghia/sculpture_artists_2020.pdfIn PDF document text
    • https://kimukotepasa.weebly.com/uploads/1/3/5/3/135329918/7591396.pdfIn PDF document text
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/4700240.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/sijetupa_xelibidatod_juwuwaboga_posidevuxefi.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/028de13e3ad87.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/3477998.pdfIn PDF document text
    • http://com-signto2.xyz/english_grammar_exercises_with_answers_form_2lxjga.pdfIn PDF document text
    • http://tonagruz.ru/fiji_airways_covid_refund_policy59c0m.pdfIn PDF document text
    • http://businesslinecenter.com/how_to_sync_rca_universal_remote_to_dvd_playerslw96.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/7778504.pdfIn PDF document text
    • https://navorajesumimu.weebly.com/uploads/1/3/4/4/134476314/xazesis-ganufakix-voseji-suwimazuf.pdfIn PDF document text
    • http://betmoy56.com/fingerstyle_guitar_long_nails39mt9.pdfIn PDF document text
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/7151280.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/zoveno-takowamobu-wawem-xenajeveg.pdfIn PDF document text
    • https://cdn.sqhk.co/sivofedexim/bhgoWig/nextbike_maastricht_price.pdfIn PDF document text
    • http://mixed-rootwork.com/fozegelunaraweryck1t.pdfIn PDF document text
    • https://vumazilizulorap.weebly.com/uploads/1/3/5/3/135300666/mulebubikisovotasage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2086ef-915a-4a29-8253-bf1b4a757ba1/dobikefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38292f7-8f54-4484-a409-8539f3066fea/harry_potter_5th_book_hardcover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8c426c-45d9-472b-af88-016c202c8a52/33673631522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a33825-37e6-46bb-bb6b-a62a9e6591d7/dekojigatuvoxerew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0101c7-d859-4f74-899a-77fdbabb0f37/21832568812.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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 5512 bytes
SHA-256: a8ddfd1dda299f67006997beaa30c773c331e6ad70b522682d0777fceeef56b8
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 9976 bytes
SHA-256: cb372889b22242ae1726ed0b72a7432195ad6c83fa7d8ac7dc16693472a516ca