Malicious PDF — malware analysis report

Static analysis result for SHA-256 8663e3b58980c55b…

MALICIOUS

PDF

85.5 KB Created: 2021-05-24 06:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4619dd8c21277ce98a3544093d533e6c SHA-1: 74dd659714d75b12cdc594f6768c22a39141a119 SHA-256: 8663e3b58980c55b15803b99dd2602d91ed1161010d8ffbcd8850fa7134367ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a secondary payload. The document body, though heavily obfuscated, contains text that appears to be a lure for downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=descargar+rendirse+jamas+por+mega PDF link annotation
    • https://geneferazudim.weebly.com/uploads/1/3/4/3/134362459/4647ab35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_604cfdfd2220a.pdfIn PDF document text
    • https://zulanamojo.weebly.com/uploads/1/3/1/0/131071117/b5be01ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_606550e5348c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459916/normal_5fef044deb4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_6042c7fcbfad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_601e32a485a61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5fff32c1e1deb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fcf7b3fd56db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5ffd47c9d9977.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/c0dee997-c4ef-470b-ac42-32e93590f92b/what_is_fox_news_talking_about_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/570e9bb3-faa9-4866-91d3-afed264b5c28/neranuvewebev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f476717d-c795-4a16-ba98-c50062c2ff79/71847191015.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/how_many_wars_did_ancient_greece_have.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/chadariya_jeeni_re_jeeni_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e32d9da-71d7-4409-bfb7-cc156383af81/weller_8200n_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b351992-72c9-4c9e-a61c-f2348b64cd48/give_me_liberty_chapter_23_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61f42ef-bcfd-4269-9739-26a54b65d715/4352602516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a2c865-7cf7-449f-879a-ef2229610f15/83952161420.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/pronunciation_guide_spanish_alphabet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 4720 bytes
SHA-256: 68bcc3075c0b7fe20c60f037133fc995f039d4e234a7374bbcb3db7d854df4b8
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 5436 bytes
SHA-256: 2af5b0737a45c387c238bd95650bafbbf2e0c893a8f9c512ec29cf50798bcb8b
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 12384 bytes
SHA-256: f9ef9ccde6d178378c416b690874c03b0939cd4e75c043a6d6e7ff39c39e3c54
font_03_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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