Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2acf8367b3d674b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 05:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 299d67ef8d499a15353329e8a0e11736 SHA-1: 13c099575b22fdfccc93888ce8a93b877f7d8a64 SHA-256: a2acf8367b3d674b9dd471462fa1f40a6014b6f89bc29f6675478d476fee5b2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external URIs suggests the document's primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://tiwtactic.com/userfiles/files/91247314398.pdf In PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/47509266205.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/matavokutixigovafojibe.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/57068878184.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/vuvizalarosikikaratopi.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/53401356168.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210914_5E89CD3B1068F28B.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5cf3d91407ed108b724009a29858368f/78022004335.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161358582118e2---70049667504.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/40961650503.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/dapedulenamoxevomonarag.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/35585633303.pdfIn PDF document text
    • https://alev.az/userfiles/file/66582808236.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/fagufazonibabomutakaperoj.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/pamatafewo.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/54475834244.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/xodutapo.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/jumexapogezixanokigemazid.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/82300458207.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/gizadogafepurovuzugivoxed.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/pebubow.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/buvoxidorujavoga.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/94121789723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=aosp+rom+launcher+apkPDF 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_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 18660 bytes
SHA-256: a48677ff3462130171986822104be0b656999c63ece6e5dbde8a9d300849423f
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 10624 bytes
SHA-256: e5f7baf3a8ceb79f872b0d11c8ea1c355f843e1825feda042aa42d5a87c1431d

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