Malicious PDF — malware analysis report

Static analysis result for SHA-256 11589e8d0cc8e839…

MALICIOUS

PDF

90.7 KB Created: 2021-02-17 13:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cd5bc672c7505830a64386f3fbc2e90f SHA-1: 52c3d04bc7b4f5d4e96c643439ebb1b4e940caf3 SHA-256: 11589e8d0cc8e83988759c854b219cd73ff11a492f8ec9f6be503f3a02e3e721
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as an algorithmically-generated URL on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of multiple suspicious URLs and the document's structure point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://seumenha.ru/wix?keyword=buddhism+for+beginners+pdf+download PDF link annotation
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/giwimuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_601b360130cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_601fb84118bfc.pdfIn PDF document text
    • http://lesagotefawa.22web.org/biomedical_informatics_stanford.pdfIn PDF document text
    • http://montana-media.com/46044268338fy3mc.pdfIn PDF document text
    • http://sokolov.fun/sesibedoririkexizogoxosalewmlm.pdfIn PDF document text
    • https://poxefapujo.weebly.com/uploads/1/3/5/3/135312596/3543332.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/xijulubibudifupaxuxo.pdfIn PDF document text
    • http://wonder-ita.fun/1365988818368185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5fdea9c24c403.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/bd_facsaria_ii_manual.pdfIn PDF document text
    • http://workshop-fb.ru/14086437036lktlz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/zupokobitebakezupuruxop.pdfIn PDF document text
    • http://burijudipo.epizy.com/93404358437.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/pulukif.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/toyota_avanza_2017_service_manual.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 5540 bytes
SHA-256: ca1adb94c3ce14251e2dc5b610a7b80502c0a94d99d254dd1747999694296c72
font_01_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 10964 bytes
SHA-256: 4359066a47a09f53ac0ff755c4c4a9f36afb13abef3940b9215dbd932335c627
font_02_sfnt_off00014f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F61 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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