Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45851b0a80b2178…

MALICIOUS

PDF

85.6 KB Created: 2021-03-29 06:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7cb43c955f11be0519c689af999dc2cc SHA-1: 2539d2b77de6b71f4438965a618dbeeabfc8eccf SHA-256: d45851b0a80b2178af05c8e8050ff0be3236f4d7ae997a0c4a42fc71956ef74a
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 0.9955

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/aws?utm_term=simple+rules+of+tajweed PDF link annotation
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/bilarupuxujime.pdfIn PDF document text
    • https://lavefikamov.weebly.com/uploads/1/3/0/8/130813740/rusokazosu.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/223292.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • http://muvirire.22web.org/lerubulez.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/cbrMxhc/tolamazomorupidurusebo.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/jjgigIn/puppy_runny_poop_teething.pdfIn PDF document text
    • https://bubafoxir.weebly.com/uploads/1/3/0/8/130874260/6326139.pdfIn PDF document text
    • https://werikaduf.weebly.com/uploads/1/3/4/4/134483952/jadamazubisifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_f7d3d8f1d79449d5969f34c503fcb66e.pdf?index=trueIn PDF document text
    • http://jelazib.epizy.com/botiwixasubowata.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_feadabf980f548f3a4d284072c9eff9a.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_f3e48933254e4f0bb0182d2e33a51026.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_1d15e6b463f44871bca6c9ff8c068319.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c443c48-e564-4749-bfd9-3b25e8e1c49d/honda_eu2000i_spark_plug_number.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/rutodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db2dcc3-3347-4a35-b2ae-e8a743ba620d/through_which_country_tropic_of_cancer_passes.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/92635392849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e81577-2871-44cd-99d8-78185c1bc302/20365964070.pdfIn PDF document text
    • http://mafulapovura.epizy.com/girabenodekilaril.pdfIn PDF document text
    • http://pamikasiwame.rf.gd/43457763533.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/arthdal_chronicles_episode_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291f278e-8092-48b3-beff-d6efd8eec472/best_book_on_chakras_for_beginners.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_bb539743902342e3bbb91c8bae7d72f5.pdf?index=trueIn PDF document text
    • http://mujawonevafo.rf.gd/tafazetir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13259ed-a3b1-46fb-9b8e-eff6cd1cf6fb/sufivumawatinatixorerosok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 5460 bytes
SHA-256: 47ffe87176a3781b858549fff3a9437c4c0e33e528595f65e88c8dddc99cbced
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 10784 bytes
SHA-256: 761724b4c020a11fee292c33f824f1d7802b09bd01da76ba515a8a99012f2892
font_02_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 19256 bytes
SHA-256: a7b857f929e577d3de22a9394fe0ee110a2760389626369170ecdb7ac11476eb