Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22756d439694a5a…

MALICIOUS

PDF

88.0 KB Created: 2021-02-28 22:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9d0681fd429a83c85e7adbf8d748b63f SHA-1: 5ecd6d3d75c57750e737b246271a95bf25cbd740 SHA-256: b22756d439694a5a1609303ad07555c6df992aefbd524b93d8e619a563f9fe9d
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 pointing to disposable hosting services like Weebly, and some utilizing UTM parameters for tracking. This behavior is characteristic of a link farm designed to distribute traffic to potentially malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=conflict+resolution+skills+for+students PDF link annotation
    • https://zewakutij.weebly.com/uploads/1/3/5/3/135327761/fofuwakovir.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/febd05110988.pdfIn PDF document text
    • https://jogemubo.weebly.com/uploads/1/3/4/3/134321321/kexonesonijuwo.pdfIn PDF document text
    • http://ukrinsure.com/4735165214c8kin.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/mapevuzitesozidanoweb.pdfIn PDF document text
    • https://namonukivanigiw.weebly.com/uploads/1/3/4/3/134309943/6360531.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/pugovawuwazukude.pdfIn PDF document text
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/jojajupojalaxage.pdfIn PDF document text
    • https://feresaxeto.weebly.com/uploads/1/3/4/6/134609658/waxuxubel.pdfIn PDF document text
    • http://huaweistoreukr.xyz/8402562103l8j8k.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/significado_del_nombre_de_jess_segn_la_biblia.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/vebifuzibekebodisa.pdfIn PDF document text
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/4aba78.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/31856434858.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/nopozuz-saxagelapujuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wujixus/ncsa_women_s_swimming_recruiting_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/statistical_quality_control_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/cash_flow_report_ms_project_2013.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/30888637951.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/bose_sounddock_portable_bluetooth_upgrade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 4776 bytes
SHA-256: 76efe1f66fdeb4bcf4a3cbc334b1999e7f1c839e27b8b02f4be20e9ff09fcbb5
font_01_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 10976 bytes
SHA-256: e2b0054e83425bd9163c8ccd0919df3ba145550605baa574902b64c3ac71f9e0
font_02_sfnt_off0001442a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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