Malicious PDF — malware analysis report

Static analysis result for SHA-256 287cf50d772589fc…

MALICIOUS

PDF

86.9 KB Created: 2021-09-14 14:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2c668b2703703dec144a8ed285d29298 SHA-1: d39409a47133d21fcbeb0009aa02603e9a74bbd3 SHA-256: 287cf50d772589fcba7af6e736409f0eae61485d11019a1548e7b4e5624d93a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to distinct, potentially disposable hosts, a common tactic for phishing or distributing further malware. While no scripts were extracted, the embedded URLs and the link farm nature of the document strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.bandungmesin.com/file/fisaj.pdf In PDF document text
    • http://www.ezmoving.com/file/64085986887.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/rulajukogufuzofiduf.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090522425356274.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mezorepub.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/51095922615.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/62238717496.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/wadotumidigip.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/janagufiniponuwotemoj.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/gigekapiwilibapokekiposo.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/12892895685.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bifomidizaxe.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/465947834.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/setupufikawutaduw.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/dukisof.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/23028585413.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/13324677368.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/12638513485.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/22737970891.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/35224178424.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/jujotutuxabuval.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/17793974460.pdfIn PDF document text
    • https://biomisszio.hu/tmp/40987188797.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/watibisetukajol.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/lufexaxojexefow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=standard+loft+of+7+ironPDF link annotation
    • 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://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_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10172 bytes
SHA-256: f94458596e454dcf5cb7ecc4b3785c95bc681f76dbdce66c576ac8ccaff11878
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 18476 bytes
SHA-256: d5083f0cd7ff21b0eba2ada43f5882487bd51e6ff5927f17e0aec271c73d2f28
font_02_sfnt_off000135f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1