Malicious PDF — malware analysis report

Static analysis result for SHA-256 1185c0fa0000026b…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 21:23:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d5a908456990423cb51804e1954a924 SHA-1: be1caa66ef017b096a713c7b20aab57502eedea3 SHA-256: 1185c0fa0000026b65f7510577a2c4854c08f60425e54d3b4906dd34b208b52a
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 0.9996

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://ponafet.ru/award?keyword=cask+of+amontillado+edgar+allan+poe+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5fd1e81a36047.pdfIn PDF document text
    • http://wogamilip.iblogger.org/gameboy_advance_roms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493905/normal_6006ee277be74.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/26193955480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_6016f0663c974.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/dozovopetobutenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448096/normal_60061d22d6d78.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/comparatif_centrale_vapeur_que_choisir.pdfIn PDF document text
    • https://tojefatonixi.weebly.com/uploads/1/3/4/3/134379405/sibinanatawagunega.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/lipus.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/verewakipudupopopikox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_605037ac96a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_5fd10ee952026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_60272e5360438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fe14c8c4510b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_601b2866c6575.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/how_to_cite_a_article_mla_8.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/ea317e8f-1b21-4a7d-80c9-159aef077d84/powermax_85_error_codes.pdfIn PDF document text
    • http://kusuganuxe.epizy.com/26605191308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42809b20-92cf-4f74-9ccf-3ee91e92be2c/jinelilev.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/agnus_dei_piano_sheet_music_free.pdfIn PDF document text
    • http://wavanak.epizy.com/72952911208.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_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 5328 bytes
SHA-256: c74e454dfc02efa03230409938b1582720d16e78eb0f51bb8f3779e21c6b584f
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 10348 bytes
SHA-256: c948e6ff77f6a7f0a85073223e67feb29796cfeff800a79dc1e257d3ddaf25b6