Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cb71c668b6a122…

MALICIOUS

PDF

77.7 KB Created: 2021-05-25 14:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 30646345781066521aed566e8a3a4e14 SHA-1: e9e95c4e64eff93c098b9461adf32468fdeb62bc SHA-256: 88cb71c668b6a1223279689e7399e18cc4e33f936d47fbf3b6a4366834a7fc49
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://midufefew.ru/strik?utm_term=how+to+get+police+frequencies+on+scanner', suggest a lure to a site that likely hosts malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://midufefew.ru/strik?utm_term=how+to+get+police+frequencies+on+scanner PDF link annotation
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/voforamirinuf_betoguwuwori.pdfIn PDF document text
    • https://biditojutorosas.weebly.com/uploads/1/3/4/6/134657596/zavezeba_kizabekekaloxoj_pogituron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_6030d60a9b427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492586/normal_606da2c34d489.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/gawitu.pdfIn PDF document text
    • https://ravixibede.weebly.com/uploads/1/3/4/5/134584659/wibimuvejej.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/7cc03d4fca2.pdfIn PDF document text
    • https://vexigijetizi.weebly.com/uploads/1/3/4/7/134771524/nisujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5fe9269e78880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ffc6a0604b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_60327708ae345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/349632b5-fe2e-4735-9766-7874b548a9ff/1270845570.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/dynamics_of_machine_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/muzijogasoxedirirari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9b8049-ad86-4db1-a2aa-c488c75a2ab5/depilepepilomumamibeno.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/lamadoxap.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/do_you_have_to_read_humphrey_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69733270-65da-4a8a-9a31-8282ef35e8b2/28232591679.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/watch_dogs_2_mod_apk_revdl.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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 5364 bytes
SHA-256: f58320f4ee3a5a0c31cb47d3ace2c8ceee4a5f71fffa87a28c8bc3590f6ef145
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10740 bytes
SHA-256: d670bd579bf78b7d186a1a1f2f14c1c8e197618d1d1ea9c2df8bf6c67958c0a5

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