Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd77e679d096ef8e…

MALICIOUS

PDF

111.9 KB Created: 2021-03-25 19:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ff5ecfa6bdecebbe171a8d16a6e812b SHA-1: ecebc2ec8abbb1a83b1ddab6f4ca44388e2b8541 SHA-256: fd77e679d096ef8e9fc578416bf4d47d70667ec7425f19bf5f9f71e2d6d0fb44
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as search results, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=sources+of+contamination+of+water+pdf
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/1f4bfe39f8.pdf
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/9489478.pdf
    • https://vajipexinonadol.weebly.com/uploads/1/3/4/0/134096003/856476.pdf
    • https://gejamuxubidiz.weebly.com/uploads/1/3/4/6/134688077/rivujirugadadef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_9dd320a467c34c7abfad2d5e003f7fe0.pdf?index=true
    • http://kasedabinat.rf.gd/83978798257.pdf
    • https://uploads.strikinglycdn.com/files/d000ec25-ee82-4c75-aa67-6324ccd74dba/sword_art_online_season_4_release_date.pdf
    • https://uploads.strikinglycdn.com/files/edd92d1a-4db4-4b92-9b1d-fcda792bcf63/john_deere_gx345_price.pdf
    • https://s3.amazonaws.com/ribowexulo/46418817469.pdf
    • https://s3.amazonaws.com/wemazun/awesome_mix_vol_2_songs.pdf
    • http://maxuxezobaromov.epizy.com/nasojoxep.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_dbdb14a634414ffc92c59d2450adfa71.pdf?index=true
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_ff0072f09ce6479699c14834cc0c503d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/76fc2722-976e-4647-a13a-700420c6c0ac/39927474312.pdf
    • http://gevewodex.epizy.com/jetiderekasagipaminoxo.pdf
    • https://uploads.strikinglycdn.com/files/fd51b415-f594-4b6f-9250-da948b25f4e7/short_poems_about_police_brutality.pdf
    • https://uploads.strikinglycdn.com/files/568c3077-6f4f-4832-9032-afa9568636e3/how_much_does_a_trampoline_cost_at_target.pdf
    • http://nitetuxal.epizy.com/46887177824.pdf
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_46a63c8188414b13a0c5aaeba93b09d3.pdf?index=true
    • https://s3.amazonaws.com/kefiperizonofu/veeche_chirugaali_nadugu_song.pdf
    • http://gogolozumer.epizy.com/bulivevigelaxip.pdf
    • https://s3.amazonaws.com/vinejivunitego/google_sheets_ipad_fill_down.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016da4.bin
5097d7883792e23426c278aace68a840d94865d0f1a4f75fc0e893b87158d650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA4 5348 bytes
font_01_sfnt_off00017fc1.bin
c75ff2527fa220b47c24d105112a0695d792b836f7893336f1139720ad525ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC1 11616 bytes
font_02_sfnt_off0001a6b1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B1 4324 bytes

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