Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfd55cb7bc52e8d…

MALICIOUS

PDF

87.2 KB Created: 2021-04-16 05:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e491dee2bc91bca13d1cc24cbb25c869 SHA-1: a0f459cfb6c2821eb534153b4b29e32dfc681250 SHA-256: 2dfd55cb7bc52e8da3dc26ba6c8e10b5e1826d52c4e67dbe7504673e75fb4a0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many of which are part of link farms on disposable hosting, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.natsihwa.org.au/sites/default/files/webform/tuwagamutavuvefofufeniz.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/zupusozuxabodes.pdf
    • https://web.liderpapel.com/sites/default/files/webform/wavunivuzabanovomid.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/fezijorimofilafomifum.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/sidetarebuw.pdf
    • https://www.jts.org.jo/sites/default/files/webform/wijuwimitixatedus.pdf
    • https://www.jwico.com/sites/default/files/webform/71926652616.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/33269367294.pdf
    • https://ambrose.edu/sites/default/files/webform/fenalop.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/79062027218.pdf
    • https://www.mainephilanthropy.org/sites/default/files/50588642306.pdf
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdf
    • https://www.dgs-interparts.be/sites/default/files/7838369457.pdf
    • https://ambrose.edu/sites/default/files/webform/futexapepunuvanujom.pdf
    • https://ambrose.edu/sites/default/files/webform/padubomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=proctor+silex+commercial+rice+cooker+manual
    • https://gradfutures.princeton.edu/system/files/webform/pelafo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb1f.bin
e2191807b46dd69677abae7f3166319ce2b5cb6581fcc6bbdecb8ca38f63553c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 2932 bytes
font_01_sfnt_off0001059c.bin
5e0dcda7c75f6ac074ffea4f0da585192c48a5df42ec9679744435a9280bb782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 4960 bytes
font_02_sfnt_off00011658.bin
057a13a5fcc2ef903fa0866a8170b6a9bb66482daeb2f43b4141b2363ab7fb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 12288 bytes
font_03_sfnt_off00013f59.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F59 4324 bytes

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