Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a4515e0bfe7187…

MALICIOUS

PDF

75.0 KB Created: 2021-05-22 08:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c4e3ec0f005afa4b8d1da58ff75a1bdc SHA-1: 7311dd4d1bb7ead5d2dea045c855ed3d8be5b273 SHA-256: b4a4515e0bfe71879fefa8788543b7a7b6b52609a9fbf357614bc528be53cc63
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are generated SEO links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL 'https://leonvi.ru/strik?utm_term=imei+lookup+using+serial+number' is likely part of the lure to direct users to malicious content.

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://leonvi.ru/strik?utm_term=imei+lookup+using+serial+number PDF link annotation
    • https://nakefofomiruni.weebly.com/uploads/1/3/4/4/134483242/gatawa.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/11cfba.pdfIn PDF document text
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/dixuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_5fe04b9d96663.pdfIn PDF document text
    • https://rezapikuxodet.weebly.com/uploads/1/3/0/9/130969426/57d3d5ce.pdfIn PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/5411161.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/fewigulebodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376878/normal_5fe5c64fa4c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_604140e5422a8.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/d0a790b4-3f72-46f4-a29c-9be31ac0a38d/mamejulapanaferebadezaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/advanced_excel_2016_exercises_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/2019_tamil_movies_video_songs_kuttyweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b326d7-77ff-4b4f-81ba-950021f4c5ba/when_is_how_to_train_your_dragon_3_release_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/wodiket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829226d7-5be7-4465-a394-dc61ba94f153/95870026622.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/is_dish_anywhere_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/nawomaram.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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 5280 bytes
SHA-256: 2d2316ad16f04a50d50188f8c29ac5478386d4d34970699ab5644ff07e9ad7da
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 10628 bytes
SHA-256: 9c03d4d04856aa2107e23c76c7da2a521d80f5708db66e153d93561a9a75b955

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