Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b25ac484e1576c…

MALICIOUS

PDF

92.5 KB Created: 2021-04-05 03:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 94321962058f8cca25625d7bc6a473f8 SHA-1: e96570a7e59bfcdc83d1ac83117ca1a9fbf77167 SHA-256: 43b25ac484e1576c05482a60e7f56ce8e483d2de1e1639824c884c14a2a008f7
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 0.9983

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://crophysi.ru/123?utm_term=growth+hormone+deficiency+nice+guidelines PDF link annotation
    • http://midarujiwuvi.mygamesonline.org/pezodanupakalos.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/calendario_juliano_2020.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/adobe_illustrator_tutorials_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_6002b65141bbb.pdfIn PDF document text
    • http://noxavikadovul.mypressonline.com/pimatifavejekudedomani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5ffa05258d1a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_60390df5a792d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497359/normal_606116d38b74d.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/what_is_power_and_politics_in_organizations.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://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_fed821acfa1447548125bef37f36340f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a1d85a-b9bc-4e7c-bacb-5b3af9962d75/sarabudoporodikipirudax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2dc7d2-1d4b-44f8-82c0-5b17df0125b6/physiological_nursing_diagnosis_for_chronic_kidney_disease.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_316c0573a0e04c2986d521470bdf2e64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuses/after_effects_logo_animation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/armed_heist_apk_obb_android.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_fb391c6069b94791b3415f2c28ee2159.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_4a6d95aa82db4e4c80a6d1c39ebc662c.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_6a514744978543c3845050eee6fa0b8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/wheel_of_life_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/aisi_lagi_lagan_audio_song.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_6fa2a805ce07414e8870d3e1252f20b8.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_8fe8ee09e6a14b1a98870dcea0270393.pdf?index=trueIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_d59e091708604f48903289194b4b4a9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd7c84f-54d0-4fb1-874c-bbcd665cefda/buku_plato_timaeus_and_critias.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 5332 bytes
SHA-256: 15280d49dc62e53ff1b02c4b51990e91c6b2f08b17330476adfc88c42cf0c4c7
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 10600 bytes
SHA-256: 4ec06654358fdd3f428f06f5f19af5abf8b9928443281f367a2cd5cb427d6b1c
font_02_sfnt_off00014158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14158 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
font_03_sfnt_off000155f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3