Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ac1648b2cdfb7f…

MALICIOUS

PDF

70.8 KB Created: 2021-03-28 07:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93ba7e0fdb23ee8a0b8f6cf16b082eb9 SHA-1: 57babe9ea37cdcdd2c85d8a2a85588615b9ec108 SHA-256: d0ac1648b2cdfb7f1a791e6de71b284517fd8e54578f3a0a7b9f621044725e27
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=ag+jeans+mens+fit+guide PDF link annotation
    • http://jiwofokiweraw.iblogger.org/28263981500.pdfIn PDF document text
    • http://itchia.space/690812545230hfpb.pdfIn PDF document text
    • http://fdvsefwfrw.space/parexuzobuxubejejex9fqml.pdfIn PDF document text
    • http://cartest.pro/mercantilism_meaning_apushhl4hc.pdfIn PDF document text
    • http://igonlinesupport.com/suntrust_finance_address2skxd.pdfIn PDF document text
    • http://laulu-go.ru/2012_highlander_limited_towing_capacityza6qk.pdfIn PDF document text
    • http://nanolenka.xyz/38666049133l94e5.pdfIn PDF document text
    • http://center-about.com/mebapinogigujuvelefivukn6ers.pdfIn PDF document text
    • http://bettermoneytips.com/we_will_be_or_we_are_going_to_bejy8v0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_f24c9324430b41f5b0acbf92563f53d1.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_5574c0d16d114a0e983df2d75f5df5df.pdf?index=trueIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_d1dd6a60b0894c128faad6300333349c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takateg/97422034124.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_120011ff709644e285741e4e8b231db6.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_a468f0bc950a48ea8b08e211ab873872.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/29034380043.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_503d2429164f4e36b863ea40ada990b0.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_b013740836b943d59f772b20bb2736ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/does_the_number_644_mean_anything.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/nadanupazakuruxa.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/42091790274.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 5164 bytes
SHA-256: d5dff8a11bae49761f5089227d2c9187673ce6aac3d83743cdc041c945671c66
font_01_sfnt_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 11976 bytes
SHA-256: f7ea766cd19d0f527e80fd8659db3f5f57d0379436b0bb3193235eafb75dc925

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