Malicious PDF — malware analysis report

Static analysis result for SHA-256 856f995de068b1c1…

MALICIOUS

PDF

150.1 KB Created: 2021-03-15 01:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9bbe217960ad0aed13129d9803bc0697 SHA-1: be22882e05449a8cdcf8635a910777ff43245986 SHA-256: 856f995de068b1c1458cf6eb1573b102f43f3b799213339a90a7d63c45fdec6e
126 Risk Score

Malware Insights

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

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 0.9515

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=contemplated+meaning+law PDF link annotation
    • http://zogonanumij.22web.org/czardas_monti_trumpet_sheet_music.pdfIn PDF document text
    • http://laditosos.iblogger.org/money_management_spreadsheet_template_free.pdfIn PDF document text
    • http://gabubixaj.22web.org/business_communication_syllabus.pdfIn PDF document text
    • http://bezugunafagomup.22web.org/how_does_i_am_the_messenger_end.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/4811231.pdfIn PDF document text
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/5424917.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://bevivose.rf.gd/jibuwoduwuruwovovutakubar.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/angular_component_template_style.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/instagram_apk_monk.pdfIn PDF document text
    • http://direwoded.rf.gd/naqaab_bengali_movie_video.pdfIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_ee188f4f8d8c40698da886dd66096329.pdf?index=trueIn PDF document text
    • http://bovifuxabobi.epizy.com/tofefe.pdfIn PDF document text
    • http://kunesapog.epizy.com/medisivajadedetupunot.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_fffd6035628b44628239683908c940e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/a._d._a._m._interactive_anatomy.pdfIn PDF document text
    • http://poposepoj.rf.gd/jiminezamomivamok.pdfIn PDF document text
    • http://gisinazujawapub.epizy.com/chevy_equinox_2016_ltz_owners_manual.pdfIn PDF document text
    • http://bimemelal.epizy.com/59059795375.pdfIn PDF document text
    • http://losikamadan.epizy.com/fewuramifadakovapesemediz.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00019300.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19300 11644 bytes
SHA-256: e29dd23122b2cde87f2a28a819511743874e6961f249d365df61d4c9d7bcac0c
stream_010_off0001ffcf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1FFCF 25516 bytes
SHA-256: fc2b0444cf8acaa1c9e485521030b3535ffb6ad93da14f32274413ed1a133ecb
font_00_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 17472 bytes
SHA-256: 635e2a2750fb4fe7842d0fbf634bc7dd9ff9a3e13b07832ac33844634adb0dfc
font_01_sfnt_off0001627d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627D 5004 bytes
SHA-256: 57bfb298e18e06068404bddfbecdb7933e570f31150bdd51af1ce74b032ef3cb
font_02_sfnt_off0001737a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1737A 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_03_sfnt_off00017e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E7E 2328 bytes
SHA-256: 864cbe2c6973b44d2b71e19ffbffb2328dcb3759b07ceb43c11d5a372fc4956d
font_04_sfnt_off00018934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18934 2108 bytes
SHA-256: d117309382da938f7dffedc42f90dd4217b4d540d75629b80669d975ecbc171e
font_06_sfnt_off0001b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B433 28908 bytes
SHA-256: a8ef2bb60e6a2a11086a631fddd5780176312f6c3b967853eb66b13a5524d35f
font_08_sfnt_off00022e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E6A 6780 bytes
SHA-256: 1b4655e28c1f43a55f4f8c30efefa472341e92cecf843dc840483865bcce72fc