Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffbff9bee057394…

MALICIOUS

PDF

78.2 KB Created: 2021-04-16 12:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5481eca3f3362ede53a0398052742cd9 SHA-1: 8ef94490c4f0c9caf975dabc48099bc95b18d28d SHA-256: 9ffbff9bee05739486d827ccfc20ff1593bb06f52e2f9ccc821e6794b93fe510
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to potentially harmful sites. The embedded URLs and the heuristic firings strongly suggest a phishing or content-scraping attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=whitfield+cascade+pellet+stove+parts PDF link annotation
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/maxerakipezi_rewuzekibutufe_mapodugij_zasor.pdfIn PDF document text
    • https://tewagolefavir.weebly.com/uploads/1/3/0/8/130814187/lolovuzaduj_mazesegib_xunel.pdfIn PDF document text
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/dulupabevaxepowuv.pdfIn PDF document text
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/rulekiwov.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/mimumuvamuvolikozu.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/1716504.pdfIn PDF document text
    • https://sozaruterir.weebly.com/uploads/1/3/0/7/130738534/27b045a7baec6f.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/4639933.pdfIn PDF document text
    • https://givurili.weebly.com/uploads/1/3/4/6/134605008/vidozo.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/segidavixofupajeb.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/jibeja.pdfIn PDF document text
    • https://tidijesugeji.weebly.com/uploads/1/3/4/7/134764535/nuxenufu-dojexafen-vosulafedis.pdfIn PDF document text
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/lodiwuzizin-xelupomipefep-dasuzasumez.pdfIn PDF document text
    • https://kodidenub.weebly.com/uploads/1/3/4/3/134328035/5078998.pdfIn PDF document text
    • https://kafubururi.weebly.com/uploads/1/3/4/2/134235359/vufebopupupi.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/7dc0547d69.pdfIn PDF document text
    • https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/nufovunebin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_f3415f9176d84717ae518044e4e11a67.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_4e28f035ee1f4bacb2c0e469ecab6d83.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_14b7b6679f0a407f94fef410cda31f76.pdf?index=trueIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_5237cf78712448eabbb4982b34075cea.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_15019ba847114bdb9c8f85e9f0bc321e.pdf?index=trueIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_b57939e6080a47c69e1f5016a7b3be86.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_2d35dd8cecc84e5ebcec844851b43957.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_f15b5d25a7274ef5bbf51fa9d8b82de5.pdf?index=trueIn 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_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 5316 bytes
SHA-256: 8b5ae6a3455ddae567ec49c08ef5360d8eb88bd7271b73e8a7d72518ce12953b
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 10796 bytes
SHA-256: 90d9e29e8f183300e1712122e7c13968b05f6b758bb060a293030cbd17cccb71

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