Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be664a20d0ce51d…

MALICIOUS

PDF

78.0 KB Created: 2021-05-28 19:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00774b2596cb8d19c69a5f1b1ea944dc SHA-1: 36d1d2a001ddf00022ba2fae8ed86559a7d627a4 SHA-256: 1be664a20d0ce51dc1f76972d7439a1127a81616a2d91f064fac245b95450403
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The document body, though heavily obfuscated, contains a seemingly innocuous title related to rice cookers, which is likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wb?keyword=how%20to%20use%20an%20oster%203%20cup%20rice%20cooker PDF link annotation
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/7fb0977.pdfIn PDF document text
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/xulek.pdfIn PDF document text
    • https://sarodinejafa.weebly.com/uploads/1/3/4/7/134762654/gelexurawinugef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_60123e4608bcc.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/057c7232c05db.pdfIn PDF document text
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/8fde002c4d6.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/dukor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_60173fe393bd4.pdfIn PDF document text
    • https://ripixupazina.weebly.com/uploads/1/3/5/3/135343237/vapejib_wilujakal_sazegepinuxoxon.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/6252870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_60571c62466f3.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/f8c94d7f013.pdfIn PDF document text
    • https://ganafotereko.weebly.com/uploads/1/3/1/1/131164127/dofoduso-vajosod-norazuvuwelilig.pdfIn PDF document text
    • https://sixijuzenej.weebly.com/uploads/1/3/7/5/137513745/4766682.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/sopukuripubanux-pazumowad-xupozeboj-puwopa.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/f95fcaca647d9.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/gesoxuvone-jonexinen-xasegad-jomavekebe.pdfIn PDF document text
    • https://talibixakezadep.weebly.com/uploads/1/3/4/5/134590085/8052172.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/313fb453-8ad2-4264-a18f-8ae4861b8588/html_for_beginners_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cb5433-c6bd-42b9-8315-b3354508e9ae/strategic_management_a_competitive_advantage_approach_concepts_and_cases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d3ff5b-d772-49c9-831c-715799498962/2432604142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/081a277f-f55c-43ea-a1ae-9056d87c50c1/philips_respironics_system_one_heated_tube.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_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 5176 bytes
SHA-256: bd7f96e3e5fe1300840b6a19bea57abea3db2f1114c8ee55ff24182397fcaceb
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 10824 bytes
SHA-256: ee4a5c25c7df5c83c5b0f09b4aacbb52922a15e52e9c3780ff416a36d0f76dee